Been trying to diagnose why I have no headlights, both low and high beams. I replaced the dimmer switch with one from GMC Paul’s. Have power on the blue wire at terminal on dimmer. Checked for power at headlight terminals, nothing. If I hook up a test light between battery + and headlight terminals - ground I get nothing. Funny if I do same test with the main power wire disconnected from battery I see ground at headlight terminals ? I checked and cleaned the main ground screw near the regulator. All other lights, side markers, turn signals work fine. How can you loose the headlight ground separately from the others ? Headlight switch bad ?...thanks I am confused...
08-07-2021, 02:21 PM
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