Question about 1997 GMC Sierra K2500

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On my 1997 gmc truck when plow light switch is turned on one truck headlight goes out and plow light on that side comes on but other truck headlight stays on and that plow light does not come on..

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This is just an idea, I may be wrong but any input is helpful, right? I would think that the switch that controls the plow lights is designed to alternate between the circuits for the truck light and the plow light. If the trucks headlight switch is turned on then the circuit is closed and turnes on the light. When the plow light switch is turned on it may cut the hot side of the circuit going to the headlight and engage the hot wire to the plow light. The headlight and plow light may share a common ground. If they don't share a common ground then the plow switch may cut the ground wire opening the circuit. If you can't find a solution you can always wire the plow lights directly to the battery with the same switch or a new toggle switch and then turn on the parking lights only on the truck. On most GM cars and trucks there is a space in the fuse pannel that is for a power accesory. It is basically a fuse slot that is empty labeled ACC. This is a 12V hot power source and you would run the positive wire here then ground the neg to the chassis. This way if you forget to shut off the toggle it will cut the hot when the key is shut off. When running the wire it is near the hood release able and you may be able to run the wire thru there and not drill a new hole. I've done this for neon lights under cars as well as stereo systems requiring an amplifier. If you drill a new hole even though its under the hood I would put a little blue RTV silicone over the new hole to prevent moisture from getting past the fire wall or road salt.

Posted on Oct 16, 2010

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