I've not heard of this happening. Had old vehicles with generators that could sit for a long time, even with a dead or no battery, and still charge without having to polarize it.
I'm wondering if there might be a regulator problem... Borderline adjustment on the cutout relay? Some regulators are polarity specific, not sure what happens if it's wrong.
Where is the vehicle stored? Is there some type of electrical equipment or process near by that could be confusing the polarity? Might also check the polarity of the battery. If it has been totally discharged, it could be reversed.
Basically just thinking out loud here... I don't know! LOL
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Today's Featured Article - Talk of the Town: What's The "Stuckest" You've Ever Been? - by Edited by Kim Pratt. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I was about 14 (part of the problem) when I got stuck. I was disking with a cab equipped IH 966. The window was dirty and I was driving into the evening sun. It was hard to see and it was my first pass down the field. I got the tractor so stuck that the underside of the tractor was resting on the ground. My uncle wanted
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