Did you check the breakers on the generator? When that happens to me it has always been one of two things.
When THE Motor Home was new... I had a problem with loose screws. I have a few friends who seem to think many RVers have a few screws loosese were the kind I tightened with a #2 Square Bit.. The wires in the power disribution center (Breaker Box) were loose. Sometime A/C worked, Sometimes the other, SSometimes both or neither.
Since I tightened those screws (one took over 3 full turns) Every time that has happened... EVERY TIME.. It has been a breaker tripped on ye old Genny.. There should be two of them, likely 30 amp.. heat and vibratrion will turn them OFF.
NOTE on mine the breakers only have ON and OFF positions, "Tripped" is off.