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Click on image for the lowdown. 
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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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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 |
Bill,
Is this right:
Black tag - 6v
Red tag - 12v
No additional voltage indicator. Can you tell from anything inside, Bill?
6v through 1955-1st
Chevrolet trucks changed to 12v in 1955-2nd
GMC changed to 12v in 1956
Lefty and Curt,
If you are referring to Chevrolet trucks (vs GMC)
Pre-1953 (37-52?) belt width was 5/8"
1953 onwards was 3/8"(53-62).
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