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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,089 Posts1,056,428 Members48,443 | | 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: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | the diagram I posted above is scanned from the Chev shop manual, the wire from the starter [violet] goes directly and only to the ignition switch ... a factory wired system will NOT start when you hit the foot switch unless the key is on - I doubt GMCs were different considering that by 55 wire colors were industry standard Bill | | |
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