1976 GMC Sierra running lights ect.

1976 GMC SIERRA
18,000 MILES • 6 CYL • 4WD • AUTOMATIC
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JACOBG
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well i have a 76 gmc 4wheel drive and i just encounterd some electrical probloms. all of a sudden none of my running lights are workin but my head lights work. i have replaced all fuses so it isent that but my running lights should come on when i turn on my light . got any ideas of what it could be?
Oct 7, 2010 at 7:57 PM
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JDL
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Did you check wiring--bulb sockets at the rear. Brown wire is voltage for tail lamps, black wire is ground. If no voltage on brown wire, at the rear, with headlamp switch on, then you need to check the brown wire at the head lamp switch for voltage. Could be faulty switch or problem with the wiring circuit somewhere.
Oct 8, 2010 at 12:16 PM