Originally Posted by Iwannacamp
Another helpful idea..maybe you are reversing polarity and it charging the ground..low amps can pop electronics.
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Okay, I guess "Back in the old days,... a motor can be a generator..." Sounded condescending to me. Apologies if I misread.
Nevertheless, as I've tried to explain, I wasn't disputing that back voltage could damage something. It was how could the voltage be applied if the switch was open.
At least one person got it so I don't think it was totally unclear.