Not sure I understand about the 2-25 amp switches but I will throw this out for you to think about. 50 amp coaches will have some type of EMS (energy management system) built in (mine is an Intellitec. These systems sense when you are plugged into 30 amps and will shut down equipment to keep you from overloading the circuits. If there is no voltage at the AC you need to be looking at the EMS system. If there is voltage at the AC look at installing the hard start capacitors.
Brian, Loretta & Daisy (Golden Retriever)
2008 Holiday Rambler Endeavor 40 PDQ , ISL 400
2014 Ford Explorer toad