I plugged the motorhome into shore power. Naturally of course the A/C unit is not putting out cold air. The rear one won't even come on. Even though the switches are set to front so that they both...
Have you actually checked the VOLTAGE insi9de the RV when the A/C is turned on? Should be at least 108 volts. If not, start there as where you are plugged in is crap.