Draboo We had the same problem last winter heading to Florida-I unhooked the 2 6volt batteries and bought a cheap 12v battery and that worked fine for us the whole 74 days we were gone-when back home I had my 6 volt batteries checked and one had a dead cell even though it was only a year old-I assume you have a bad battery cell-I would also check the inverter or converter to see if it is putting out juice when plugged into shore power --we found a blown fuse--hope this helps--Rich
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