Your Main Power does need to be toggled on. I will be honest... I need a road map to understand the wiring in theses rigs... But I was just at my rig having battery issues so the main power switch was off and I did not have power to the Thermostat even with the Genny on, therefore no A/C. Once I started the truck it provided the 12v power source and the thermostat came on and the A/C along with it. Of course that does not explain the Microwave??? Something to do with the Inverter maybe?
Now that my battery is functioning again... I turn on the main power, start the Genny and the A/C works fine even without the truck running. I think I also had the inverter on... Not sure if that is required.
Griswald One - Life is a Misadventure!
2015 Greyhawk 29ME / Chevy Sonic