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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Aug 2008 Posts: 10 New Guy | | New Guy Joined: Aug 2008 Posts: 10 | I'm troubleshooting the wiring in my 64 GMC. The headlight switch works for all four lights at the parking light position. Front and rear lights work for brakes and turn signals. When in full headlight on position, the rear lights stay on but nothing goes on up front. Tested the dimmer switch and only get a read on the blue wire. So can I conclude the headlight switch is the culprit? | | | | | Joined: Jun 2003 Posts: 565 'Bolter | | 'Bolter Joined: Jun 2003 Posts: 565 | If you're getting power to the dimmer it should'nt be the headlight switch. Headlight switch to dimmer - dimmer to high or low beams. Are you getting anything through the dimmer switch? Only power on one terminal no matter what position of dimmer? Sounds like maybe a bad dimmer switch.
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
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