Now that you're plugged into 50 amp shore power, don't you have some kind of instrumentation that shows you how many amps your inverter/charger is kicking in and what the battery voltage is? Like a Xantrex or Magnum control panel? If so, and the charger is kicking in around 100 amps (which it should be) and the voltage doesn't go above 12 v, your batteries are completely shot.
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Rich
2002 Magna Resort 42
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