1. Salesmen switch would have NO affect on the roof AC operation. BUT, IF the salesman switch is OFF, THAT would affect the operation of the roof AC controls(tstat). But it would not affect 120 to the AC
2. So, from the description, his battery disconnect is OFF. Find the switch and turn it on
3. Inverter/Chargers are NOT wired thru the battery disconnect switch. They are connected directly to the coach battery bank.
4. Yes, you should always disconnect 120 power when changing batteries, but I doubt that is the cause of your problem.
5. What is strange is you state you have interior dc lights that work. They should NOT work if the battery disconnect is OFF.
6. Also, you may have a EMS(120 energy management system) system that controls your AC units and the microwave and THAT requires 12 volt and 120 power to be ON. Doug
PS, I would be a rich man if I had $100 for every customer that stated with 100% certainty that he had ALL battery cables connected correctly and did not miss a wire or connect it wrong when changing his batteries. When then come in I point it out and they were positive they did it right. If it worked correctly before YOU messed with it, the odds are it is something you did wrong
