Not the question you asked, but something to know
You said inverter
An inverter uses the batteries and makes 120vac
A Converter uses 120vac shore power or generator power and supplies 14vdc needed to charge the house/camper batteries and power the lights , water pump, appliance n controls etc..
A combo inverter-charger does both
I'm an not familiar with your RV, but think it probably has a converter, not a combo unit
A brand name and model number will let us clarify what you have
It sounds like the house batteries are Not being connected via the disconnect switch or are possibly dead
Can you get voltage reading on the charged batteries while on shore power, it should be above 13v while charging, also get a reading in the converter, from any of the fuses, or from any red and black wires
You may have more batteries, or the charge solenoid might not be working correctly, or there could be a blown fuse in that circuit
