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Diagram of light switch pins im not doing things quite by the book so my wiring is different from the standard wiring im running my park and headlight circuits through some relays and controlling them by grounding the circuit at the light switch ill just document the switchs standard function here to avoid confusion. Gm headlight switch circuit functions gm headlight switch circuit descriptions 0 ground output wire through the rheostat 1 12 volt battery unfused feed into h l switch circuit breaker o feeds power to 7 when headlight switch is in park lights on position. If you want to troubleshoot a headlight problem in your chevrolet siverado youll need this headlight wiring diagram unlike many other headlight systems the normal headlights and drl lights are two separate systems but theyre both controlled by the body control module bcm when you turn on the headlights the headlight switch passes . This video is a detailed walkthrough of the american autowire headlight enhancement relay kit our kit includes separate relays for the high and low beams as well as upgraded gxl wire to make . Cut a length of yellow electrical wire with wire cutters to serve as the headlights power wire the wire must be long enough to connect the headlight control switchs positive wire to the motorcycles ignition wire splice one end of the wire onto the ignition wire with a t tap connector