Chuck,

I understand why you are hoping to find the problem in the power supply or the transfer switch. To put that question behind you and allow you to zero in on the problem turn off shore power and the generator and allow the inverters to function.

If doing that still fails to deliver power to the circuits in question, you can start to assume the issue lies with the inverter. On your coach like mine Liberty has provided input power to the inverters via the circuits marked "battery charger 1 and battery charger 2". Access the inverter in question, and carefully verify if you have power on the input wires. You will need shore power or generator power input to do this. Be careful. There should be two sets of input wires to each inverter, one set going to the inverter input, the other set going to the battery charger circuit. They are connected in your house electrical panel to the same circuit breaker.

If you have input power, but no output power the problem lies with the inverter, and as I said previously I would look first at the P&B relay.