Car Relay Wiring Diagram For Lights. In this video we look at how relays work why they are a good idea and how to install them in your vehicle. From the relay harness tap the red wire to battery positive and the black wire to ground.
The line you spliced off your high beam wire or your backup light wire. It can be used for various switching. Understanding how the relay works will help with diagnosis and modifications to vehicle systems.
It can be used for various switching.
As in the diagram a wire is run from a 12 volt power source to the switch in the cab and out to the relay placing a fuse at the source of the power. 6 reasons for tail lights not working but brake are easy fix. As relay has both normally open and normally closed connection pins. From the relay harness tap the red wire to battery positive and the black wire to ground.