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Maybe the alternator was bad or going out to begin with rather than the battery. Are all of the connections clean and tight on the alternator? I have seen alternators going bad that smoke (even when the battery is hooked up right). Is it putting out a good charge? I have 2 old tractors that are positive ground. I believe vehicles generally used to be positive ground (6 volt), so maybe it didn't do any damage, the polarity was only reversed. I always have to think twice when jumping a positive ground tractor from a vehicle with a battery that is negative ground.
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