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Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,179 Posts1,057,134 Members48,463 | | 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!
| | THANKS!
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: Mar 2005 Posts: 627 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 627 | My understanding is that an original 47-53 GMC radio will work with either positive or negative ground. Can anyone confirm this? Thanks.
Mike Barnes
1950 GMC 1-ton pickup
| | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | 50GMC,
that is correct if it is equipped with a mechanical vibrator. If it has the new electronic vibrator replacement, the electronic unit will be made for either positive ground or negative ground, but not both. | | |
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