prstlk,
Hopefully you will come back and re-visit your problems. What you should know by now is that if you are not plugged in or running the generator the Magnum panel should be showing Inverting. That is correct. The inverter drains your batteries of 12V power to create 120V power when there is no other power source available. Plugging the coach in or starting the generator would then supply 120V power to the inverter and that power would be used to charge your batteries but you will no longer be inverting as it is not necessary.
If you are certain that your house and/or engine batteries are not being charged then there is an issue related to the engine alternator which is where the replenishing power would come from while you are driving. There are a number of folks here who have given good advice on how to check to see if your batteries are gaining or losing voltage with the engine running and once you have a handle on that you should be able to figure out what is or is not working properly.