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Click on image for the lowdown. 
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| | | Forums66 Topics128,010 Posts1,055,308 Members48,419 | | Most Online14,466
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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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | The light switch is a good guess - it has built-in circuit breakers. You might want to check the wiring connections to the light switch. Do you have a GMC Maintenance Manual - check the electrical section? Here is Chev truck wiring - your GMC's could/should be the same. | | |
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