1981 GMC Sierra Headlight Issue

[larey]

Look at this thread "http://67-72chevytrucks.com/vboard/showthread.php?t=545416" and get your manuals first is what I would recommend as it normally shows you what to look for. For your year on page 977 of the repair manual it shows what to look at first and what to test with a multi-meter.

Second part did you have gauge lights before you changed the dimmer switch in the dash?

I looked and could not find a circuit breaker or relay for you set-up except inside your actual headlight switch, on page 1069 which has the schematic on it.

Hope this may help..

Larey