I'm also thinking you may have a ghost amperage draw on the chassis battery. You can test for this by testing DC current from neg battery to chassis. (there's more detailed info on u tube etc on how to do this) Coach batteries are typicaly deep cycle and if they're not being charged ( either by shore power,or mh charging system with engine running) they will discharge over time . You may want to look at some means of charging them while unit is not being used ( battery charger or solar panel charging kit) . Wouldn't be a bad idea to test for ghost amperage draw as well
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