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OK so here's the deal. I ran a 100' extension cord to the 110 shore power adapter last weekend while the boat is on the hard to do some dewinterization. Didn't notice the reverse polarity light on but could have been. We left it plugged in for 2 days while charging the batteries, powering a sander, small portable heater in the cabin, had TV on for a couple hours and also ran the radio. When we got ready shut everything down I noticed the red reverse polarity light on. I had replaced the male end on the cord I used before using it, could it be possible I had the wires turned around? Can low amperage cause the problem? One last question, what kind of damage does reverse polarity cause?