12 Volt Automotive Relay Wiring Diagram

A relay is an electrical switch that is controlled by a low-power signal to control a higher-power circuit. Relays are used in a wide variety of applications, including automotive, industrial, and consumer electronics. In an automotive application, a relay is often used to control the power to a high-current device, such as a starter motor or an air conditioner compressor. The relay is controlled by a low-power signal from the vehicle's ignition switch or another control module. The following diagram shows a typical 12 volt automotive relay wiring diagram:

12 volt automotive relay wiring diagram

The diagram shows a relay with two terminals, labeled "85" and "86". These terminals are connected to the vehicle's battery and ground, respectively. The relay also has three other terminals, labeled "30", "87", and "87a". The "30" terminal is connected to the power supply for the relay coil. The "87" terminal is connected to the load that the relay is controlling. The "87a" terminal is a normally open contact that is connected to the "87" terminal when the relay is energized. When the ignition switch is turned on, the low-power signal from the ignition switch is applied to the "85" terminal of the relay. This causes the relay coil to energize, which closes the contacts between the "87" and "87a" terminals. This connects the load to the power supply, allowing it to operate. When the ignition switch is turned off, the low-power signal is removed from the "85" terminal of the relay. This causes the relay coil to de-energize, which opens the contacts between the "87" and "87a" terminals. This disconnects the load from the power supply, preventing it from operating. Relays are an essential part of many automotive systems. They allow a low-power signal to control a high-current device, which is necessary for safety and efficiency. ## How to Wire a 12 Volt Automotive Relay Wiring a 12 volt automotive relay is a relatively simple task. However, it is important to follow the correct steps to ensure that the relay is installed correctly and safely. The following steps will show you how to wire a 12 volt automotive relay: 1.

Identify the terminals on the relay.

The relay will have four terminals, labeled "85", "86", "30", and "87". 2.

Connect the relay to the battery and ground.

Connect the "85" terminal of the relay to the positive terminal of the battery. Connect the "86" terminal of the relay to the negative terminal of the battery. 3.

Connect the load to the relay.

Connect the load to the "87" terminal of the relay. 4.

Connect the control signal to the relay.

Connect the control signal to the "85" terminal of the relay. Once the relay is wired, it is important to test it to make sure that it is working properly. You can do this by turning on the control signal and checking to see if the load turns on. If the relay is not working properly, you may need to troubleshoot the problem. Here are some common problems that can occur with automotive relays: *

The relay is not getting power.

Make sure that the relay is connected to the battery and ground. *

The relay is not getting a signal.

Make sure that the control signal is connected to the relay. *

The relay is not closing.

Make sure that the relay coil is working properly. If you are unable to troubleshoot the problem, you may need to take the relay to a qualified technician for repairs. ## Conclusion Relays are an essential part of many automotive systems. They allow a low-power signal to control a high-current device, which is necessary for safety and efficiency. Wiring a 12 volt automotive relay is a relatively simple task, but it is important to follow the correct steps to ensure that the relay is installed correctly and safely.

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