How

If you are using a cable to connect or charge mobile and compact gadgets like mp3 players, smartphones, cameras, printers, or GPS devices, then most probably, you are using a micro USB cable.

Micro USB cables can be of different types. With the many choices out there, it’s common to get confused with many things to consider. How do you know which micro USB cable to use with different gadgets, and what are the types?

In this guide, we will tell you all you need to know about USB micro cables so that you can always pick the right cable for your purpose.

Chapter 1: What is a Micro USB Cable?

A micro USB cable is the smallest form type of the  Universal Serial Bus (USB) and comes with two connection types and USB 3.0. Micro USB cables provide a convenient means to connect various devices and plug them into your chargers.

Micro USB cables are useful for devices where you cannot use standard or Mini USB connection ports because of their size or usability. All micro USB cables provide the same performance as you would expect from a standard-size USB cable.

Chapter 2：Micro USB types

In the chapter, we will discuss the market’s different types of micro USB cables.

Micro USB A

The micro USB-A is a compact connector in a trapezium shape. Measuring 6.85mm in width and 1.8mm in height, the connector has slanted edges that allow easy orientation while plugging the cable. The connector transmits electric and data signals with the help of five pins: Vcc, D+, D-, ID and Ground. The VCC and Ground can supply a 5 Volts DC supply while Data +/- transmits data signals. ID helps in mode detection.

The following table gives you complete information about the micro-USB A connector.

PIN	NAME	Wire color	Function
1	Vcc	Red	+5 volts
2	D-	White	Data negative
3	D+	Green	Data positive
4	ID	N/A	Mode detection
5	Ground	Black	Signal ground

Micro USB B:

The structure and shape of the micro-USB B are similar to Micro USB A, featuring a trapezium shape with a slanted top and bottom. Like micro USB A, this shape allows the connector to orient easily while you plug the cable. The PIN in micro USB B is also five, but the shape and size of the pins differ from that of micro  USB A. You can use this connector for data transmission and charging compacted devices like mobile phones.

The following table gives you complete information about the Micro USB B connector.

PIN	NAME	Wire Color	Function
1	Vcc	Red	+5 volts
2	D_	White	Data negative
3	D+	Green	Data Positive
4	ID	N/A	Marker pin for OTG devices
5	Ground	Black	Signal Ground

Micro B 3.0:

Micro B 3.0, a superspeed version of Micro USB B, has ten pins. These extra pins enable it to transfer data at high speed, manage power effectively and make it compatible with larger devices.

Popularly called SuperSpeed USB, this micro-B 3.0 shows backward compatibility with old USB standards. However, you must know that USB 3.0 is incompatible with all devices. If you want to use this superspeed USB 3.0, the computer port and the device must be compatible with the new standard.

The following table gives you complete information about the micro-USB 3.0 connector.

Pin	Name	Cable color	Function
1	VCC	Red	+5 volts DC
2	D-	White	Data negative
3	D+	Green	Data positive
4	ID	Dark Blue	Mode detection
5	GND	Black	Ground signal
6	USB3 SSTX-	Blue	Superspeed transmit positive
7	USB3 SSTX+	Yellow	Superspeed transmit negative
8	GND	Not Applicable	Ground signal (return)
9	USB3 SSRX-	Purple	SuperSpeed receive negative
10	USB3 SSRX+	Orange	SuperSpeed receive positive

Important information:

• Port: This is the place where USB cable plugs into
• Type: It defines the shape of the connector or the port
• Version: It defines the technology allowing data transfer along the cable.

Chapter 3 : Types of Micro USB Cables

Before diving into the types of micro USB cables, let’s learn a bit about the USB connection standard.

USB cables were introduced in 1994 by some tech companies to provide a unified connection standard for transferring data and electricity.

These cables are widely used today for different devices and come in different generations, like USB 1.0, USB 2.0, and USB 3.0.

The USB 1.0 and 1.1 can transfer data at 12 Mbps, mostly outdated.

USB 2.0 is the most popular cable, capable of achieving 480 Mbps transfer speeds.

The USB 3.0 can clock 5 Gbps, while the newer USB 3.1 can reach 10 Gbps data speeds.

USB cables feature forward and backward-compatible technology, which means you can use the cables irrespective of their generation (USB 2.0 or USB 3.0) as long as the connectors are the same.

The cables will automatically adopt the lowest USB standard when using cross-generation devices.

Micro USB cables are also classified into USB-A, USB-B, and USB-C types and feature different connectors.

You can differentiate the cables with your eyes, but you can’t tell whether it’s a USB 2.0 or USB 3.0 just by looking.

Here are the common types of micro USB cables-

Micro-A USB Cables

On-the-go (OTG) devices commonly use the Micro-A USB cable and differ from the normal USB connection.

You can establish communication between two devices using Micro-A USB without a computer acting as a mediator.

Micro-A USB cables come with a female, rectangular-sized connector.

You can easily identify a Micro-A USB cable by looking at its compact 5-pin design and white receptacle.

Micro-A USB cables often are compatible for use in conjunction with Micro-B USB gadgets.

The OTG devices normally have a Micro-AB socket, which provides ports for supporting both connection types.

Micro-B USB Cable

The Micro-B USB standard is in most smartphones and small electronic gadgets.

There’s no difference between USB 1.1 and USB 2.0 in the Micro-B ports case; they look the same.

The Micro-B USB cable is available with both male and female connectors, so you can use devices using different connection types.

Generally, you will see a female connector on smartphones, whereas the cable comes with a male connector.

Micro-B USB connectors appear like a half-hexagon in shape, as the ports and connectors feature tapered edges.

Generally, the cables have a black-colored receptacle and portable 5-pin design.

USB 3.0 Cables

USB 3.0 cables can be compatible with both Micro-A and Micro-B USB ports.

The cable connector size of USB 3.0 is a bit bigger than USB 1.0 and USB 2.0 standards and is suitable for handling the high transfer speed of USB 3.0.

Remember that Micro-A and Micro-B don’t use the same connection standards.

The new generation of USB 3.0 standards presents a double-socket connection port.

USB 3.0 devices generally use a cable divided into two connectors to ensure backward compatibility.

You can use one connector for older Micro-A or Micro-B cables, while the other is reserved only for USB 3.0 connections.

Many new smartphones have started using USB 3.0 as it offers a 10 times performance increase compared to USB 2.0.

You can also use improved power efficiency and additional features like USB streams to leverage data throughput for storage devices.

Smartphones using USB 3.0 generally have dual-mode device connections.

The functionality enables you to use the single port as a peripheral port while also playing the part of a host port.

Now that you know about different micro USB cables, let’s learn more about their applications.

Chapter 4: Micro USB Application Options

You can use micro USB cables for a wide range of applications.

Can you even find a micro USB to HDMI cable to directly access all your favorite videos and movies?

Please keep reading to learn more about micro USB cables and their applications.

Micro USB to HDMI Cable

Tablets and phones have displays to help you watch movies, play games, or see videos.

But for many people, the screen size is too small, and they need something bigger!

Micro USB to HDMI cables enable you to connect MHL-enabled tablets and smartphones with TVs or other display devices using the HDMI port.

It is a convenient and cheap method and doesn’t need you to get lost in a mess of cables.

The micro USB to HDMI uses the micro USB port of your tablet or smartphone and passes the signal to the adapter, which converts it to HDMI format to connect with your TV.

If your TV doesn’t support MHL, you must connect a USB power cable to the converter, which provides a charge to your phone or tablet.

You can use your TV display to play games, browse the internet, watch movies in HD, see photos, and more.

The micro USB to HDMI cable supports both video and audio.

The recent standard of MHL can provide 8-channel surround sound and even play videos at 4K resolutions.

Older versions can support 1080p video formats with 7.1-channel digital audio.

Before buying the micro USB to HDMI cable, you should check if your tablet or phone is compatible with MHL.

Micro USB Extension Cable

Do you find the length of your micro USB cable too short? 

Can’t charge your phone sitting on your couch as the cable doesn’t reach the wall power outlet?

Using a micro USB extension cable, you can resolve your problems in an instant.

The extra length of cable serves as an extension between devices or cables and helps you cover more area than you can with a single cable.

The extension cables have a micro USB male port and a micro USB female port.

The extension cables can support USB 2.0 or USB 3.0, so you should consider your data transfer needs before choosing one.

The connectors at the end of the micro USB cables also vary.

You can find micro-A ports, micro-B ports, and some newer versions that also come with a Type-C port.

So, checking the ports of the devices you want to connect is necessary before buying a micro USB extension cable.

Some solar panels also use micro USB cables; the extension cords can help establish connections over increased distances.

Micro USB to Micro USB Cable

Micro USB to micro USB cables connect two devices to transfer data or power.

For example, you can connect two tablets, one tablet, and a smartphone or two smartphones to exchange data or charge the device.

Micro USB to micro USB cables have micro USB ports at both ends.

One end of the cable is generally labeled as “Host,” which you need to plug into the controller device.

The cable carries power from the controller device at the host end to the other device, while you can transfer data both ways.

The cables come in handy when you don’t have a charger nearby to emergency charge one device by sourcing power from another.

You can also establish a direct hardline connection between devices using the micro USB to micro USB cable and eliminate the need for extra adapters and lag in performance.

The device connected to the “Host” port must support On the Go (OTG) functionality.

Most Android smartphones and tablets are OTG compatible, so you can be sure your device can use micro USB to micro USB cables.

Micro USB to micro USB cables have a wide range of applications.

Besides connecting tablets and smartphones, you can connect external hard drives or SSDs to carry out the data read and write function.

You can hook up other accessories using a micro USB to a micro USB cable.

For example, cable connects keyboards, cameras, and controllers to your tablet and smartphone.

The accessories must have a micro USB port so that both devices can work without glitches.

We have now discussed various types of micro USB cables like micro-A, micro-B, and USB 3.0.

Recently a new variant is available in the market called USB Type-C.

In the next chapter, we will discuss Type-C cables and find their difference from micro USB cables.

Chapter 5 : The Difference between Micro USB and USB Type-C

Are we looking to choose between a Micro USB and a USB Type C?

You aren’t alone – many make that choice each day.

While it was the former earlier, it is the choice for many these days.

We will take a look at why.

What is USB Type-C?

You can find USB Type-C in new smartphones, laptops, and tablets.

The new standard is slowly evolving to replace the older USB standards and even works for other technologies like Thunderbolt and DisplayPort.

USB Type-C features all the new improvements, and some smartphones have even replaced their 3.5mm audio jack with Type-C connectors.

Type-C also supports new USB standards like USB 3.1 to achieve higher transfer speeds and improve power delivery using the USB connection.

The USB Type-C cables have a new type of connector, similar in size to a micro USB connector.

USB standards have moved from 1.0 to 2.0, and now we have USB 3.0, but the connectors never changed.

USB Type-C introduces a new connector that meets the small needs of smaller and thinner devices available today.

You can also plug in a Type-C cable without checking its orientation, as it’s reversible.

Most of the current devices have been transformed into USB Type-C, to don’t need to carry around a bunch of different USB cables for different devices.

USB Type-C also improves the power delivery over older standards like USB 2.0, which can carry 2.5 watts of power.

Type-C increases this limit to 100 watts and uses a bi-directional technology to send or receive power while you can exchange data simultaneously.

Some new laptops like Google Chromebook Pixel and MacBook provide USB Type-C ports for charging.

In the future, all devices can switch to Type-C to make charging and transmitting data convenient.

Now, let’s check out the differences between micro USB and Type-C.

Micro USB cable VS USB Type-C cable

Micro USB cables generally have a micro-B USB connector at one end and a rectangular-shaped Type-A USB connector at the other.

Most micro USB cables use the USB 2.0 standard, while some new smartphones feature the USB 3.0 standard.

You can’t connect micro USB cables interchangeably, and they must fit in one way.

There are two hooks on the lower side of the connector to keep the cable in place.

Micro USB connectors were introduced as an industry standard to replace the proprietary connectors used by brands like Samsung and Nokia.

USB Type-C cables have a roundish, oblong-shaped connector, which promises to bring unity in the field of different connectors.

Though it looks bigger than the micro USB connector, it is more streamlined and compact.

The Type-C connector is reversible, which means you can connect it any way you want.

You don’t have to flip it numerous times to ensure the right side goes in!

USB Type-C connectors mostly use USB 3.0 and 3.1 standards, which means they can offer better performance than micro USB when it comes to data transfer speeds (5 Gbps to 10 Gbps).

It can also support up to 100 watts of electricity, enabling you to charge even your laptop or cameras.

Some manufacturers offer Type-C connectors but use USB 2.0 standards due to the low power requirements of smartphones or tablets.

USB Type-C can replace the old Type-A connectors in devices like tablets, smartphones, laptops, cameras, HDMI, game controllers, scanners, printers, and more.

USB Type-C is more versatile than micro USB and is not limited by design.

Chapter 6：Micro USB Vs. Mini USB: What’s the difference?

Between the Micro USB and Mini USB, Mini USB is the earlier version. It was introduced as the first miniature form of USB in 2005. Roughly shaped as an anvil, the Mini USB connector has 5 pins. 

When it was introduced, it was used for Digicams, MP3 pliers, cell phones and various other devices. Due to its small size of 3mm by 7mm, it was widely accepted in the market. Further, its capability of connecting and disconnecting 5,000 times made it highly durable.

On the contrary, Micro USB was introduced in 2007 and displayed better functionality and more convenience than Mini USB. It has five pins, out of which the fifth one is the ID pin. It could function as both Type A and B connectors. On the other hand, the ID pin of the Mini USB offered no value.

Further, Micro USB has a round top with a flat bottom. Its size is smaller, i.e., 6.85mm by 1.8 mm, and 10,000 connect disconnect cycles.

Additionally, you can transfer data faster at 480Mbps with Micro USB. You can find micro-USB ports on various Android devices, tablets, phones, or other devices like GPS navigation devices, digicams, video game controllers, etc.

The best part of Micro USB is its capability to support USB OTG or USB On The Go. This feature allows tablets and phones to work as hosts for small devices like USB flash drives, mice, and keyboards.

So, with this, you can connect and use several devices with your tablet or smartphone. This option is not available in Mini USB.

With this comparison, it seems that Mini USB technology is useless and must be obsolete. However, some devices still use Mini USB ports and connectors.

Conclusion

Micro USB cables are still widely used to connect tablets and smartphones and charge devices worldwide.

We at Wiringo can help you know more about micro USB and the implications of manufacturing cables based on the standard.

Our expert and professional team caters to businesses of all sizes and helps them meet their custom micro USB needs.

We can deliver high-quality cables accurately matching the specifications of your wiring diagram with a quick turnover time.

Contact us as soon as possible for a private consultation to learn more.

It is midday in summer, your car cooling fan is blowing, and then everything comes to a grinding halt.

What do you think might have happened? 

In most cases, the fault is terrible fan relay wiring.

Reading along, you will learn all about your vehicle’s cooling system.

In particular, you will find how necessary the fan relay wiring is to the system.

What is the Cooling Fan Relay?

Cooling fan wiring diagram

A cooling fan relay controls when the electric radiator cooling fan turns on and off.

It does so based on the temperature information from your car’s electronic control module or a thermostatically controlled sensor. 

For example, if the thermostatically controlled sensor measures an abnormal engine temperature, it signals the cooling fan relay to send a 12-Volt electric charge to power the fan.

Consequently, your radiator receives a constant gust of cool air bringing its temperature down.

Once the temperature drops below the threshold, your car’s electronic control module sends a new signal to the cooling fan relay instructing it to switch off the charge. 

However, you will find cars with electric cooling fans running after the engine shuts off. 

What common symptoms indicate you may need to replace the Cooling Fan Relay?

Old relays

Here are the typical signs that you need to replace your cooling fan relay:

• Your engine temperature is higher than usual. It means the fan relay does not respond to the thermostatically controlled sensor or electric control module signals.
• Your electric fan continues to run even after you turn off the ignition. Here, you may have a blockage within your fan relay system, causing the switch not to toggle between on and off.
• Air-conditioning does not function. Some vehicles’ air conditioning compressor fans also use the fan relay to turn on and off. Consequently, they fail to turn on whenever there is a fault with the cooling fan relay system.

Where Do the Four Wires Of an Electric Fan Relay Go?

A relay without housing

Use our fan wiring diagram and guide to ensure you correctly wire your fans to your relay.

Before that, let’s have a clear picture of where the four wires of an electric fan relay go.

• First， wire 85 connects the relay to the thermostatic switch, determining when the fan is operational. 
• Secondly， wire 86 is the connection to your car’s ignition switch.
• Third， Wire 87 connects to the electric fan’s positive wire.
• Finally, wire 30 links to your car battery, requiring a constant 12-Volt current.

The wire insulation colors may vary depending on your electric fan relay kit supplier.

How to Wire an Electric Fan with A Relay?

The type of electric fan cooling system you use depends on your required cooling.

As such, you can opt for either single or dual cooling fans.

Additionally, the installation procedure may vary depending on your electric fan relay kit.  

Wiring a Single Cooling Fan.

  single electric fan

1.  First, remove your car’s stock mechanical fan and mount your electric fan onto your radiator.
2.  Then, install the single relay where it is safe from excessive heat and water. Exposure to these elements can compromise the functionality of your new cooling system.
3.  Next, connect each of the wires as per the wiring diagram. For example, wire 30 only connects to the fan’s positive terminal.
4.  Finally, if all connections are correct, your engine should receive sufficient airflow to cool it.

Wiring Dual Cooling Fans.

Dual electric fans

The process of wiring double electric fan relay systems is similar.

However, the space available may cause you to make some adjustments.

For example, you can use a single activation fan relay for both fans.

However, doing so will require you to use a higher gauge connector wire and fuse a slightly higher amperage.

Below is the procedure for installing a dual-activation Fan Relay.

1.  First, remove your car’s mechanical fan and mount the dual electric fans onto your radiator.
2.  Secondly, install the activation fan relay kit in a heat- and moisture-free location. Depending on their required power, you can opt for a single activation fan relay for both fans. However, you will need a dual-activation fan relay if they draw more than 15 amps each. Cloom recommends the AR-79 with an amperage rating of 60 amps.
3.  Next, install a 30-Amp fuse on both wire 30s of the dual activation fan relay and splice them to a single wire before reaching the battery. You can also add a circuit breaker to the setup to prevent short circuits.
4.  Then, splice both wires 85 from the dual activation relay and join them to a single conductor that connects to the thermostatic switch. Additionally, make sure that you have a ground connection from both fans as well. Finally, splice the wire 86 of each relay and conjoin them to a single conductor that connects to your ignition switch or your car’s fuse box.
5.  With all connections in the right place, your engine cools even when idle.

Note:

The information is the standard installation procedure for Cloom electric fan relay kits.

Also, you can refer to the wiring diagrams for each type to ensure that you have the correct connections to complete the circuits. 

FAQ

Why is an Electric Fan Better Than a Mechanical Fan?

If you take into account a number of things, then you can effectively use a mechanical fan for high HP (horsepower) applications.

A shroud, bigger radiator, and bigger clutch fan would most likely keep the engine cool; a mechanical fan could, in some cases, function better than an electrical fan.

With some, not only are the electrical fans keeping the engine cool in traffic but also at stop lights. A mechanical fan can only keep things as cool as possible according to the engine speed.

However, an electrical fan draws the max cfm when idle since it works independently of engine rpm.

The only setback to installing additional electrical components to your car is that, in most cases, the original alternator wasn’t designed to facilitate current draws of over 45 to 60 amps.

Therefore, if you add a dual or single electrical fan, you’ll need to use a beefier alternator in order to increase your charging system’s output.

How to Wire the Fan Relay?

Relays are relatively simple, and there’s a standard 5 or 4-prong relay that almost everyone uses. The 5th prong (87b or 87a) is not usually used unless for particular circumstances. 

On a standard relay, there’s a switch system working at a lower amperage than what the component uses.

A relay protects a switch circuit since most automotive sockets aren’t designed to convey high currents. The relays consume the current turned on by a triggered connection either by a temperature transmitter or switch.

Hence, why are two wires of a bigger gauge size compared to the other two?

To turn on the relay, the 2 smaller wires create a connection from ground to hot; over 12 V are received from the ignition source, and a negative connection is received from the temperature transmitter designed to turn on at 185⁰C.

Once the connection is created, a magnetic pull completes the connection between 30 and 87 terminals, totally isolated from the switch connection.

Despite it not being crucial to connect the 30 to your battery (12 V power source), it’s the standard. That connection provides the 12 V to the component (fan) connected to terminal 87. 

Relays are capable of handling loads of higher current compared to switches. However, even relays have current rating capacity they can’t exceed.

If exposed to an excessively high current, the circuit will open, and the relay won’t work. Therefore, it’s essential to use a relay with the current load rating that your fans need.

Caption: Fan Relay

When Do You Need a Second Fan Relay Kit?

With a smaller fan, you can connect both fans to one relay and install a fuse to protect your circuit while still providing sufficient current flow without going over the fuse rating. If your fuse blows, this is a sign that you’re drawing too much power on your system and need to add a second relay kit.

If you have a bigger fan that draws over 15 amps, it’s best to install a second relay kit.

Will a Custom Relay Wiring Harness Make Installation Easy?

If you buy a relay kit, it contains all the necessary connectors to splice wires together. It’s highly recommended to use a good crimp connector and follow the instructions provided in order to ensure you have a hassle-free installation.

However, you can make the installation way easier by customizing your own relay wiring harness.

For instance, an immaculately configured relay wiring harness has fuses in the power supply side of the headlamp power circuit, very close to the power pickup point, inches away from the alternator B+ terminal or battery positive terminal. 

Conclusion

As you can see, an electric fan relay is necessary to ensure the painless performance of your engine cooling system.

Additionally, you can also add an air conditioning relay.

It allows extra automation from the ac pressure switch for additional temperature readings. 

Consult Wiringo for all your automobile wiring harness solutions and installation guides.

Are your mechanic bills spiraling out of control?

Chances are you are paying for a repair job you could do yourself.

Unfortunately, many modern vehicle owners lack the basic knowledge of how a car functions.

For example, do you know where your car’s starter solenoid is?

Or Are you aware of how to wire a starter solenoid?

If the above questions sound Martian, buckle up and continue reading.

Below is Cloom’s DIY guide on the starting system.

With this information in mind, you can replace the starter solenoid or relay it yourself.

What is A Starting System?

Diagram showing a car starter system

Although technology has changed much of what is in a car, the ignition components are still more or less the same.

Battery Cables

Car battery cables

For your engine to start, it needs a high current which usually comes from your car’s battery.

The cables that carry this charge from the battery must be thick enough to withstand the high amount of electricity flowing through them.

When you look at your car battery, you usually see two cables.

These cables connect the battery to your car’s starting system.

First, the red one connects the starter solenoid to its positive terminal.

This wire is usually live, so be careful when handling it.

Then, a black or greenish-yellow cable connects the starter motor to the battery’s negative terminal.

Starter Relay

Car starter relay

A starter relay controls when the high current flows to the starter motor.

That is, it’s responsible for igniting the starter solenoid so your car can start.

It does so by sending current to the ignition switch.

As such, you can use the battery power for other things, such as using your power windows and car radio without cranking the engine.

The starter relay is thus crucial to the ignition because the high current passing through would fry your car if the relay weren’t there to keep it safe.

Starter Motor

Assorted Car Starter motors

The starter motor is the reason why your car’s engine starts.

It’s usually around where your car’s engine is, but it could also be a separate unit like in BullDozers.

It needs a healthy supply of 12-Volt charge from the battery to perform.

Neutral Safety Switch

neutral safety switch

A neutral safety switch prevents your car from jerking when the engine starts.

The neutral safety switch usually works the same in automatic and manual cars, using your car’s PCM inputs to engage.  

Starter solenoid

starter solenoid

The starter solenoid has two functions in your car’s starting system.

Firstly, it completes the circuit between the starter motor and the power source (car battery).

Then, it engages the starter gear to the engine flywheel facilitating it to crank up.

How does the starting system work?

Start the engine

Moving the ignition to start allows the current to flow to your starter solenoid.

Next, the starter solenoid pushes the motor gear to engage with your engine’s flywheel.

So, the starter motor turns the flywheel that spins the crankshaft, forcing the engine to start.

You should also know that the starting system only works when the car is in Neutral or Park.

Furthermore, the system cuts off once the engine starts revving.

Symptoms that you need a replacement of your starting system

Do you know that most problems are related to the solenoid?

car starting problems

You are missing the distinct click noise when starting the engine.

Most cars produce a clicking sound right before an engine starts.

It results from the starter relay switch completing the circuit and the starter solenoid engaging the starter motor with your engine’s flywheel.

So, failure to hear this sound when powering your car indicates a problem with one of the two.

You experience a continuous clicking noise when starting your engine.

Any rapid noises from your vehicle or show that something is wrong.

For example, if your car keeps clicking rapidly with each start, you have solenoid problems.

In most cases, such noises mean the power received is not enough to start your motor.

So, before you rush to replace your solenoid, check your battery and alternator first.

Your engine has a noticeably slow crank.

Engine cranking is a fast motion that only takes a few seconds.

Yet, sometimes your car sounds like it is struggling to get going.

Some instances may result from a low battery.

But, if the issue persists after jumping the power source, the chances are that you have a solenoid with burnt contacts.

Thus, your only way out is to replace it with a new one.

No crank of the engine.

Finally, you know you must replace your solenoid when your engine doesn’t start.

For example, as you turn the ignition key, all car functions are fine, but the starter motor won’t engage no matter what you do.

The first opinion is to check for poor connections.

If everything is fine, then your best bet is to replace the starter solenoid, which is likely why your car won’t start.

The Importance of a Starter Solenoid

A solenoid is a vital part of your car’s starting system. The solenoid efficiently engages your starter motor, protects the motor from damage, ensures safety, and assists in prolonging the life of your car’s electrical system.

If you’re experiencing any issues with the solenoid, it’s important to have a professional electrician or mechanic take a look.

Caption: Starter Solenoid

Symptoms of a Failing Starter Solenoid

The symptoms of a faulty starter solenoid could overlap with the symptoms of a faulty starter; however, the opposite doesn’t apply. Therefore, any whining noise, clicking, and cranking but failing to start aren’t symptoms of a faulty solenoid, just your starter.

The primary symptom of a faulty starter solenoid is the absence of a response from your engine once you turn your ignition key.

The best method of testing a solenoid is by attempting the shorting method or checking the voltage using a multimeter across the large poles with and without turning the ignition key. If no current is detected, this is a clear sign that the mechanism of the solenoid is faulty.

Caption: Multimeter

How to Replace a Starter Solenoid

The process of replacing a starter solenoid is not so difficult. All you need is a socket set or a couple of wrenches and, in some cases, a wire brush for cleaning wires. Simply follow the steps below.

1. Find your starter solenoid, usually mounted in your starter or on the side of your engine bay.
2. Keep track of the mounting positions for your wires and make marks if necessary.
3. Disconnect the ignition wire and unscrew any bolts, keeping the power lines in position.
4. Unscrew the solenoid mounting bolts.
5. Install your new solenoid and reconnect the wires.
6. Try starting your engine to ensure everything works.

Then, How do you Wire a Starter Solenoid?

Starter solenoids come in two types.

Firstly, you can use the on-starter solenoid that directly mounts on your car’s starter motor. 

Or, you can also opt for a remote-mounted solenoid.

These types of solenoids operate across a wide temperature range and are pilot-operated.

Additionally, they feature a single coil spring return and come with SIL 2 & 3 certification.

Furthermore, they can either feature a 3-pole or 4-pole solenoid switch.

The procedure is different when you use either pole.

On-Starter Solenoid vs. Remote-Mounted Solenoid

on-starter solenoid

1. First, secure your vehicle using chokes on the front and back tires. Then, disconnect your car’s negative battery terminal.
2. Secondly, lift your car using the stock jar to a height with enough space to get underneath. Additionally, add a jack stand near the jacking point for extra security.
3. Then, crawl underneath and mark each wire referencing their respective connection locations. You can use masking tape and a marker for the labeling. Additionally, use a wrench to disconnect each wire and unplug the wiring harness from the solenoid.
4. Subsequently, remove the starter motor carefully by unbolting it from your engine. You will need to unbolt remote-mounted solenoids for their specific installation area.
5. Finally, reconnect the wires to the new solenoid as per the labels. Then, lower your car from the jack and reconnect your battery’s negative terminal.

3-pole starter solenoid vs. 4-pole starter solenoid

4-pole starter solenoid

The main difference between a 3-pole starter solenoid and a 4-point starter solenoid is how they work and their connection to the field coil.

In 4-pole starter solenoids, the four terminals speed up the motor.

On the other hand, in 3-pole solenoids, the terminals’ primary function is to launch the starter motor.

Furthermore, 3-pole solenoids feature a series connection with the field coil compared to the parallel one in 4-pole solenoids.

Thus, 4-pole solenoids can still function with varying battery charges since the NVC and field winding are on different circuits.

However, the connection process is generally the same. If you position it on your bumper or another part of your engine bay, then the solenoid’s backplate acts as a ground; therefore, you won’t need any grounding wire.

Four Pole Solenoid

You can easily identify the 4 pole solenoid thanks to the two front-facing poles and the other two poles protruding to the right and left. 

The left pole functions as an input connecting to your battery cable. On the other hand, the right pole functions as an output towards your starter. The two poles are distinguishable by thickness and ability to facilitate heavy gauge wires transporting high currents.

On the front side of your solenoid, there are two poles opposite each other. The thinner wire travels from your starter switch through your neutral safety switch (and, in some cases, relay) down to your left pole. Therefore, acting as a control for the relay while your starter and battery poles transfer power.

Three Pole Solenoid

The 3-pole solenoid connects similarly to the 4-pole solenoid. However, they do not have a smaller terminal for the ballast resistor or ignition coil connection.

Depending on the pole’s orientation, it could be difficult to determine the purpose of the poles.

Some designs have the poles sticking out right, left, and up of the solenoid, meaning none of the poles face forward.

The slim pole should face up and connect to the starter switch. While the right pole connects to the starter and the left connects to the battery.

Some designs have all the poles facing forward; however, the same rule applies with the starter pole always at the top, splitting the right and left poles.

To play it safe, it’s always best to check the solenoid instructions before jumping to conclusions.

Tips For Troubleshooting Starter Solenoid Wiring Issues

If you are having some problems with the starter wiring, here are some tips to help you resolve the issue.

• Check your battery – first, check your battery to ensure it’s fully charged and has at least 2.6 V. If your battery’s dead or low on charge, it could be the root of your problems.
• Inspect your wiring – inspect the cables from your starter to your battery for any signs of damage like frayed cords or corrosion. If there are any issues, replace or repair them accordingly.
• Check your solenoid connections – check the connections at your starter to ensure they’re secure and tight. A loose connection could cause the solenoid to experience some issues.
• Test your solenoid – test your solenoid for voltage and continuity using a multimeter. If there’s no voltage or continuity, you might need to replace your solenoid.
• Check your starter – if no red flags appear on the solenoid test, you’ll need to check the starter itself. Ensure your starter is properly connected and all the wires are in good condition. If you find the starter defective, you’ll need to replace it.
• Check your ignition switch – if both the solenoid and starter are properly functioning, the problem could be the ignition switch.

Conclusion

Starter solenoids and starter relays are essential parts of any vehicle’s ignition system.

They need regular maintenance checks and wiring to continue working properly.

But no matter what kind of help you need, Wiringo is always available to provide you with the best automobile wire harness solutions and guides to ensure your vehicle is always running. 

Do you know what the basis of an electric device is? It’s the circuit. The circuit is a circular path having the same beginning and ending points. The current flows in a circuit from a power source and takes it to the electrical device. This current comes back to the power source. And here’s how the circuit completes itself.

The device works well until and unless there is a perfect continuity test of the current. If continuity breaks, the device stops working. It’s quite easy to check the continuity with the continuity test.

Now, let’s know what and how about this test in detail.

What is a continuity test?

As the name suggests, the continuity test checks the continuity of the current. Simply put, it checks if the current flows freely from one end to the other.

There are devices such as multimeters or ohmmeters to perform this test. You can also find some specialized continuity testers for the test. These testers are basic, low-cost, and have a bulb to indicate the current flow. 

In this test, you provide a small voltage between the two testing points of the circuit. If something interrupts the current flow (or electrons), the circuit is open. The interruptions can be due to damaged components, cracked conductors, or high resistance. If there are no interruptions, it is a continuous circuit.

Why do you conduct a continuity test?

In electronics, continuity testing is quite important. You can perform this test to check various things within a circuit, such as:

• You can check the quality of soldering. Sometimes, soldering is a cold solder connection. Most of the time, you cannot identify it visually. Such soldering appears connected, but in reality, they are not.
• Sometimes, there are broken wires within the circuit. You can check the wire connection with the continuity test. This is especially important for power cords and headphone wires. These wires appear normal from the outside, but there can be some damage in reality.
• Also, identify any damaged components within the circuit.
• Do this test to know if two points have a connection in them or not, as in PCB.
• You can also verify the schematic diagram with the continuity test.

Image: Electric multimeter

How to test continuity with a multimeter:

As discussed above, you can use a multimeter to perform this test. To learn more about these safety tools, read further. First, understand the Multimeter or Ohmmeter.

This device can test various other electrical issues apart from testing the continuity of the electrical path.

You can test for AC/DC voltage, open circuit, short circuit, or amperage.

This is a rectangular tool with a dial or digital setting. With this dial, you can set the tool for the test you want to perform.

Like a continuity tester, a multimeter also powers through a battery.

You will find multiple holes at the front of the multimeter. Out of these, one is “COM,” which means short for “common.” This is for the ground. Another hole is mAVΩ, which means “measure amperage, voltage ohms. This is used to measure current. Apart from these two, there is a port of “10A”. You can use this for measuring very high currents. 

It has two wire leads: red and black. You have to plug the black into the COM slot and the red into the mAVΩ slot of the multimeter. The other ends of the wires have metal probes.

Continuity Test for capacitor:

Before performing the test, you must remove the capacitor from the circuit and discharge it completely.

Test with continuity mode:

• First of all, set the dial to continuity mode.
• Secondly, plugin red and black probes into multimeter sockets as described above.

• Connect the other end of the multimeter’s red probe to the capacitor’s positive terminal.
• Following this, connect the capacitor’s negative terminal with the multimeter’s black probe.
• If the capacitor works well, the multimeter will show”0” initially. The multimeter charges the capacitor. With this, the reading reaches infinity or OL. The “OL” reading shows that the capacitor is open and charged completely.
• You will see a very low value (short) or infinity (open) in a damaged capacitor

Image: continuity test for an extension cable

Test with resistance mode:

• First, set the multimeter to resistance mode.
• Connect the red and black probes to the positive and negative terminals of the capacitor.

• The capacitor is good if the resistance readings start from “0” and reach infinity. This shows that it was charging initially.
• If you get a very high initial resistance, it means the capacitor is damaged.
• If there is low resistance, your capacitor is short.

Continuity Test for Inductors:

An inductor is a coil; to test it, you must remove it from the circuit.

Test with continuity mode: 

As described above, set the dial to continuity mode.

Plug red and black probes into multimeter COM and V-ohm sockets

Connect the red and black probes to the positive and negative terminals.

In case the inductor is working well, the multimeter will beep. You will see a very low value of readings. However, you cannot identify any short turns of the inductor.

In case of a damaged inductor, the multimeter will not beep and show “1” or “OL” readings indicating an open circuit.

Test with resistance mode: 

First, set the multimeter to resistance mode. Try to adjust it to the lowest possible readings.

Secondly, connect the red and black probes to the positive and negative terminals of the inductor.

If the ohmmeter shows a few ohms resistance, the inductor is good. 

And if you get very high initial resistance, the inductor is damaged.

Or if there is low resistance (near zero), the inductor might have short turns.

Test a Wire For Continuity With a Multimeter

Caption: Testing For Continuity Using a Multimeter

• The first step is connecting the red and black terminals with the respective slots. 

• Then, once you turn on the multimeter, set the dial on the device to test for continuity. However, if your device doesn’t seem to have a continuity setting, you may still do the test by setting the dial to the smallest amount in resistance mode.

• Now, make sure the device is working by touching the terminal’s metal parts together. Keep in mind:

1. If the value you get on your multimeter is lower than one, then the device is properly functioning. 
2. Also, if the value is exactly zero, then the device is functioning. 
3. However, if the value you get is high or you don’t hear a beep, confirm the dial settings on your device. Next, inspect the ports you plugged into your terminals. 
4. Replace the terminals before checking the manual to determine how to reset your multimeter. If on the screen it displays one on the far left side and not the position values are normally displayed then it means you have a broken signal. A broken signal is an indication of faulty terminals. 
5. If the values keep fluctuating a bit, this is perfectly okay. 

• Turn off and unplug the device you intend on testing. However, it’s obvious that you can not unplug a connected wire. Test the connected wire by turning off the vehicle, appliance, or device.

• Stick your black terminal on either end of your exposed wire. Ensure that the metal part at the end of your terminal is constantly in contact with the piece you want to test.  

• Place your red terminal on a different part of your wire while keeping your black terminal on the first end of your current. 

• Then, press the exposed red terminal on the opposite end of a linear current, such as the opposite end of your wire.

• Give the values some time to stabilize, then confirm the readings to determine the resistance. Note:

1. If the reading is zero, this indicates perfect continuity.
2. If the reading is lower, this indicates bad terminals or good continuity.
3. If the reading is between 1 – 10, whether this is a problem depends on the device. Therefore, refer to the device’s manual to determine if this is an acceptable level of resistance. In the meantime you could play it safe and postpone using the device.
4. If the reading is over 10, this indicates poor continuity. This means the resistance is higher than normal, and you should replace the wire.
5. If you get no reading, this indicates that you have a broken circuit.

Image: Electrician checking the fuse box

Continuity Test for fuse:

Repeat the same process as you did with cables and wires.

The meter reading “zero” means the fuse is in good condition.

While an “infinite” reading means fuse continuity is broken.

Continuity Test for switch/push buttons:

You can conduct the same test as above for switches and push buttons.

However, in this case, you need to do the test in both “on” and “off” conditions.

Firstly, take the reading in the “ON” mode. Secondly, repeat the process for the “OFF” mode.

In the first test, you must get “zero” and “infinite” for the second test.

This means your switch and push-button are in good condition.

On the other hand, if both readings are “0” or “infinite,” the switch is in a short circuit.

In this case, you must replace the switch/push button.

How to Test Continuity without A Multimeter:

You can use a Continuity Tester for testing metal pathways.

A battery is the source of power for this tester. You will find a metal probe at one end of this tool. On the other end, there is a wire lead, which either has an alligator clip or a probe. 

Its working is quite simple. Just touch the metal probe and wire lead with each other.

If the circuit is complete, the light or buzzer will go off. You can also find an LED or any other visual indication in some devices.

Similarly, you can test the electrical path for a device, appliance, or circuit.

Ensure that the power supply is off before using this tester, as using it on live wires is dangerous.

If you do not have one, no worries. You can make a Homemade Continuity Tester.

Get a 9v battery, buzzer or LED resistor, and two wires. Connect them as shown in the figure. Your continuity tester is ready.

Conclusion:

Testing the continuity of circuits is vital for major electronics repair. Checking the circuit continuity helps you pinpoint any issues with the integrity of the circuit. However, to prevent any issues with your electrical devices, you must start early.

Go for high-quality cable assemblies and wiring harnesses. Wiringo offers you the best solution for wire assemblies.