Just bought a 2008 challenger A class by damon. The same day we bought the rv, the previous owner replaced the coach batteries. When we arrived to view the rv, the engine, and generator were running ...
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Also when you said
Gen started and had coach electric. Used steps a few times total (literally) and after couple of days opened door and steps wouldn't engage.
When the steps opened for a couple of days was that with generator off and no shore power hooked up? If so then you know that the house batteries were at least initially charged.
If your batteries were initially charged then be aware that the house batteries will only have enough power to run the systems for a few days. If you run the heater at night you can pretty much bet on the rule of thumb of "one night per battery" before the batteries are drained and can't power the house.
