You most likely have a bad cell in the battery bank. Today's charging systems a pretty good, but they do not know if the battery bank has a problem and will overcharge good cells if a bad cell is in the circuit preventing the total bank to come up to proper voltage. Check each cell with a hydrometer and you will probably find a cell or two weaker than the rest. Change out the batteries and then you can check the charging system. I think you will find that it is ok. If you have a large inverter to run the microwave, TVs and thing off receptacles, it is probably you batter charger as well and a good one at that. Good luck and keep us posted.
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Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
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