sounds like an inverter/converter problem.
Can we tie all of the issues together? Are they related?
You have three conditions for power. Shore power, generator power, battery power.
All of the systems you are reporting as not functioning all operate from 12 volt power.
When on shore power, the voltage from the plug outside is converted to 12 volt power by the converter while some 110 volt is passed directly to 110 items (microwave,power outlets).
When the generator is operating, it takes over from shore power and it's power is converted to 12 volt power by the converter while some 110 volt is passed directly to 110 items (microwave,power outlets).
When on battery power, 12 volt is drawn directly from the batteries and no 110 is provided anywhere unless you have an inverter, which you most likely don't.
The A/C itself draws more than 12 volts, but the thermostat runs on 12 volt. Control boards for the tank and battery checking would operate on 12 volt. The control board for the levelers would operate on 12 volt.
- Did the issues start before or after changing the batteries? We would like to rule out the possibility that batteries could be improrperly wired.
- When you describe the A/C / Heater, could you be more specific? Does the thermostat turn on at all? If it turns on, what happens when you attempt to control the temperature?
- Same question on the levelers. What happens when you press the level button? Did they ever work?
- Are you saying that when you release the Aux button, the motor stops?
- With regard to the genset, can you define "cuts the truck out"?