Starter relays are an essential component of a vehicle’s electrical system. They provide the required electrical power to the starter motor to crank the engine. The 5 pin starter relay wiring diagram is a basic guide to help you understand how the relay works and how to wire it up correctly. In this article, we will explain the different parts of a relay, how to test it, and how to wire it up properly.
What is a Starter Relay?
A starter relay is an electrical switch that closes a circuit to allow current flow between the battery and starter motor. The relay switches on when the key is turned to the “start” position, and switches off when the key is released to the “run” position. The starter relay prevents the starter motor from being engaged while the engine is running, which could cause damage to the engine and starter motor.
A starter relay consists of several parts, including the coil, contacts, and housing. The coil is an electromagnet that pulls the contacts closed when power is applied to it. The contacts are a set of metal plates that close to complete the circuit when the coil is energized. The housing is a protective casing that encloses the coil and contacts.
How to Test a Starter Relay
Before wiring up a starter relay, it is essential to test it to ensure that it is working correctly. To test a starter relay, follow these steps:
| Step | Description |
|---|---|
| 1 | Disconnect the battery |
| 2 | Locate the starter relay |
| 3 | Remove the relay from its housing |
| 4 | Check the resistance of the coil with a multimeter |
| 5 | Apply voltage to the coil to check if it pulls the contacts closed |
| 6 | Check the contacts for continuity |
If the relay fails any of these tests, it should be replaced.
How to Wire a 5 Pin Starter Relay
The 5 pin starter relay is a common type of relay used in vehicles. It has five pins or terminals, including two for the coil and three for the contacts. The pins are labeled differently depending on the manufacturer, so it is essential to refer to the wiring diagram provided with the relay.
To wire a 5 pin starter relay, follow these steps:
| Step | Description |
|---|---|
| 1 | Disconnect the battery |
| 2 | Identify the terminals on the relay |
| 3 | Connect the positive terminal of the battery to terminal 87 on the relay |
| 4 | Connect the negative terminal of the battery to the vehicle’s chassis |
| 5 | Connect terminal 85 on the relay to the ignition switch |
| 6 | Connect terminal 86 on the relay to the vehicle’s chassis or ground |
| 7 | Connect the starter motor to terminal 30 on the relay |
| 8 | Connect a fuse at the positive terminal of the battery |
Once the relay is wired up, test it to ensure that it is functioning correctly before starting the vehicle.
FAQs
What happens if a starter relay fails?
If a starter relay fails, it may prevent the vehicle from starting. The starter motor may not receive the required voltage to turn the engine over, and the engine may not start.
How do I know if my starter relay is bad?
You can test a starter relay with a multimeter to check its resistance and contacts. If the relay fails any of the tests, it may need to be replaced.
Can I use a different type of starter relay?
It is important to use the correct type of starter relay for your vehicle to ensure that it will work correctly. Using a different type of relay may cause damage to the vehicle’s electrical system.
How long does a starter relay last?
A starter relay can last for several years if it is maintained and used correctly. However, if it is exposed to extreme temperatures or moisture, it may fail prematurely.
Can I replace the starter relay myself?
If you have some basic knowledge of vehicle electrical systems and the proper tools, you may be able to replace the starter relay yourself. However, if you are unsure or unfamiliar with the process, it is recommended that you seek the assistance of a qualified mechanic.
By following these guidelines, you should be able to wire up a 5 pin starter relay correctly and troubleshoot any issues that may arise. Remember to always consult the wiring diagram provided with your relay and test it to ensure that it is functioning correctly before starting your vehicle. With proper maintenance and care, your starter relay should provide reliable service for many years.
