David Scranton Posted November 7, 2022 Share Posted November 7, 2022 Just a quick question that i cant find a solid answer for. Just meed to know if my 31 buick uses a 6 volt positive ground, or if not, what it uses so when I go down to work on it next ill know if i need to grab the 6 volt battery out of my Allis Chalmers. Thank you. Link to comment Share on other sites More sharing options...
Bloo Posted November 7, 2022 Share Posted November 7, 2022 I am 99% sure that 30s Buicks are all 6 volt NEGATIVE ground. 4 Link to comment Share on other sites More sharing options...
Mark Shaw Posted November 8, 2022 Share Posted November 8, 2022 100% Neg ground. You will need a battery like this: Tractor Battery-6 Volt Tractor Battery | Agri Supply #18379 | Agri Supply 3 Link to comment Share on other sites More sharing options...
David Scranton Posted November 8, 2022 Author Share Posted November 8, 2022 1 hour ago, Mark Shaw said: 100% Neg ground. You will need a battery like this: Tractor Battery-6 Volt Tractor Battery | Agri Supply #18379 | Agri Supply I just happen to already have that exact battery for my tractor LOL 8 hours ago, Bloo said: I am 99% sure that 30s Buicks are all 6 volt NEGATIVE ground. Thank you very much, thats all i needed to know 1 Link to comment Share on other sites More sharing options...
DonMicheletti Posted November 8, 2022 Share Posted November 8, 2022 "31's dont use that battery. They use a conventinal square battery under the passenger side floot board. 1 Link to comment Share on other sites More sharing options...
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