4 Pin Relay Wiring Diagram

Learn how to wire a standard 4-pin automotive or powersports relay in this quick video. We'll go over a basic 4-pin relay diagram, explaining what each pin on the relay does.

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We'll cover:

Pin 30 - This connects to the positive voltage supply that powers the relay. Often this comes from the vehicle's battery.
Pin 85 - The coil power pin that energizes the relay when powered.
Pin 86 - The coil ground pin that completes the relay coil circuit.
Pins 87 and 87a - The relay switch pins that the output connects to. When the coil circuit is powered, these output pins will either connect or disconnect based on whether it is a normally open or normally closed relay.
We'll demonstrate step-by-step how to connect the relay,switches, battery power source, and ground. You'll learn how to control a relay to switch power to accessories, lights, or other electronics in your vehicle or trailer.

This 4 pin relay wiring tutorial works the same in cars, trucks, boats, motorcycles, ATVs, golf carts, and more. After watching, you'll understand the basics of operating and wiring a common 4 pin relay.

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