Mechanics

GMC VAN DIMMER SWITCH PROBLEM

1991 GMC Van • 100,000 miles

Headlights including low and high beams dont work. What is the cause?
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Guest
January 4, 2013.



Have you checked the fuses? Also do you have a multi meter to do some testing?

Saturntech9
Jan 4, 2013.
That's what you pay mechanics to diagnose. The most likely cause is a defective head light switch, especially if the tail lights also don't work. The next suspect would be the dimmer switch. Check both connectors for blackened terminals or signs of melted plastic.

Caradiodoc
Jan 4, 2013.