Paul127,
It sounds like when you have the inverter "ON" you have 120v power in the coach but if the inverter is "OFF" no power on the output side of the inverter and NO charging.
The next thing to check is with a ac volt meter you should have 120v at the input of the inverter on NEU IN and HOT IN 1. If there is no power there you have to go back to the panel and see where you lost power. You will need to remove the side cover on the inverter to access the terminals.
If there is power then the transfer relay board inside the inverter is bad. The board senses ac input and will close the relay which passes power to the loads and also powers the charger.
The AC Board is replaceable.
Gary
