Inverter on?
Another possibility: With my 2005 GS Voyager, when connected to shore power I still need to have my inverter turned on for it to provide the AC (shore power) to DC (12v battery power) conversion.
For better feedback you might want to be specific about which battery you are talking about. Most RVs have atleasts two batteries : 1) Chassis battery = to the battery that powers your engine and things like driving lights, blinkers, cab heat/ac, etc. 2)Coach battery = separate battery, or bank of batteries used to power the 'home' lights, Refrigerator, etc. when the engine is not running. Depending on which one you are talking about will change how this gets diagnosed.
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