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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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: Feb 2011 Posts: 10 New Guy | | New Guy Joined: Feb 2011 Posts: 10 | I'm little new to this and have a 52 3100 that has all original running gear and electronics, can anyone tell me if theese trucks ran a positive or negative ground?? | | | | | Joined: Sep 2010 Posts: 575 Shop Shark | | Shop Shark Joined: Sep 2010 Posts: 575 | My 49 is a negative ground. | | | | | Joined: Jul 2001 Posts: 3,887 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Jul 2001 Posts: 3,887 | welcome to the garage 52bolter, if you have a Chev it is neg
Bill | | | | | Joined: Feb 2011 Posts: 10 New Guy | | New Guy Joined: Feb 2011 Posts: 10 | Thanks for your help, I had it hooked up that way and it ran and lites worked, but when I took my Generator to be rebuilt as it was not charging, the guy said it should be a neg grd. Has anyone heard of this?? | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Thanks for your help, I had it hooked up that way and it ran and lites worked, but when I took my Generator to be rebuilt as it was not charging, the guy said it should be a neg grd. Has anyone heard of this?? Is that a mistype? As posted above, your truck was originally negative ground. Here's an ignorant side-observation: it has been a long time since I had to deal with a bad generator; but, years ago when I had a charging problem I'd take both the voltage regulator and the generator to the electrical shop. I thought this would allow a professional to confirm where the problem was and allow for adjustment of the voltage regulator, if necessary. | | | | | Joined: Feb 2004 Posts: 29,740 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,740 | Chevy electrical systems were negative ground, while GMC's of the same year had a positive ground system. The generator can be polarized to work either way. Original-equipment regulators had different part numbers for positive or negative ground polarity, while most replacement units are wired to work with either polarity. I second the motion to let the rebuilder adjust the generator and regulator as a matched set. Back in the 1950's, my father had contracts with several trucking companies to rebuild and calibrate generator/regulator pairs, which were swapped out on a time or mileage cycle for preventive maintenance. This practice virtually eliminated charging system-related road breakdowns.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
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