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JD Model A electrical

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Dave K

03-19-2000 13:09:01




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I have a 1948 Model A magneto ignition, 12 volt system. Recently I was told this tractor should be wired with a positive ground. Mine is hooked up with a negative ground and works fine. Does it matter?

dave




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Dave K.

03-21-2000 13:22:35




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 Re: JD Model A electrical in reply to Dave K, 03-19-2000 13:09:01  
Thanks John,

All works well, the ammeter reads correctly, the battery stays charged, so I guess I'll leave it alone. I was just curious what the difference is in a pos or neg ground. Perhaps with a battery and coil ignition it matters. Mine is a mag.

Dave



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John T

03-19-2000 14:31:01




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 Re: JD Model A electrical in reply to Dave K, 03-19-2000 13:09:01  
Dave, if it really has a magneto, then it has nothing to do with any battery whatsoever regardless if pos or neg ground. Now originally that tractor was positive ground but if its hooked up negative and works and the generator gens it doesnt make much difference assuming the ammeter (if you have one) leads were reversed to show proper operation for negative ground. If it keeps the battery charged I wouldnt worry about how its hooked up for now, but if you reverse the battery you would have to re polarize the voltage regulator. Ol John T in Indiana

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