The dome light is operated off the dash light dimmer rheostat on the light switch. Turning the light switch knob clock wise brightens the dash lights and all the way turns the dome light on. No idea how cleaning up the wiring under the hood would affect the dome light. The dome light wire doesn't go under the hood at all, not on factory wiring. The Dome light wire should go down the kick panel under the matting above the rocker panel and up to the Dome. Hope that helps.
Do you have the factory manual for the GMC?
Larry
Last edited by LGriffin; 10/14/2009 12:06 AM.
