12vdc Relay Wiring Diagram

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The diagram above is the 5 pin relay wiring diagram. There are different kinds of relays for different purposes. It can be used for various switching. Relay can be the best option to control electrical devices automatically.

Looking at the diagram, we see the pinout of a typical 12v relay. Note that each pin is numbered. 85 and 86 are the coil pins while 30, 87, and 87a are the contact pins. 87 and 87a are the two contacts to which 30 will connect. If the coil is not activated, 30 will always be connected to 87a. You can think of this as the switch in off. My defender originally came with the original bullbar with spots attached. They use to work when i trigger brights via the steering stalk. The lighting system was poor so i added the headlight relay wiring harness and couple months ago removed bumper and spots.