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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!
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| | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | Jerry,
I'd bet it's a 6v fan. Maybe someone has a Blue Chip GMC accessory/option brochure? GMC changed all models to 12v negative ground by 1956.
The earlier 6v systems would have been positive ground.
A 6v fan would probably run on 12v negative ground - my guess is that it would be a faster RPM.
Maybe the Moderator will move this to the electrical forum?
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