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battery polarity
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Posted by 550Doug on May 14, 2006 at 08:48:35 from (64.7.131.27):
Can a 12v battery change its polarity?
I have a 12v battery that at one time was in a Pos-ground system, but I now have it in a Neg ground system. I'm doing a charge on it and have just noticed when I do a voltage check the black lead of my voltmeter, when placed on the'+' battery terminal, gives me a +12.2 volts reading. However, when I do a voltage check on any other 12v battery (like in my car), the black lead of the volt meter on the '-' terminal gives me a +12.4v reading. To me this indicates that I have a Neg ground battery in the car, but a Pos ground battery on the tractor. Does this mean that I cannot use a Pos-ground battery on a tractor that is wired for Neg ground?
Thanks
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