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Re: where is the headlight relay on a 1977 gmc 3500
Quote:
Originally Posted by bigdaddy4x4
i bought a set of h4 headlights to replace the old ones on my 77 k3500 now they flicker on and off i can barley hear a clicking noise behind the left side of the instrument cluster but i dont see no relay
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As long as the truck hasn't been modified, there is no relay in the headlight circuit. The headlight switch operates the headlights directly.
The factory wiring diagrams are located here, if it helps trace down the problem. http://67-72chevytrucks.com/vboard/s...d.php?t=545416
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1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome!
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