welcome to the forums.
Since you were able to run the heater all night after some period of charging the batteries from the ginny you may not have a bad batteries. They may just need a good charge and check fluid levels. Typically the on board converter doesn't do the best job of charging batteries.
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Axis 24.1 E 450 chassis, 6 spd tranny. GVWR 14500# GVCWR 22000 # GW(scales) 12400 #
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mods: 2- 100 watt solar panels, on roof, 300 watts portable
“They who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety.” Benjamin Franklin
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