Gary, (Erin, NY)
In addition, most every RV generator today is equipped with integral circuit breakers, completely independent from the panelboard distribution box located inside the RV. There is a good possibility either of two circuit breakers on the generator has tripped.
In a typical configuration, you’ll find two independent breakers on the generator. One protects the output circuit which feeds a second roof air conditioner while the other protects the output circuit powering the rest of the RV. If all the circuit breakers inside your coach have not tripped, check the breakers on the generator itself. They are usually located near the control box of the generator, but each model may be different. You may have to refer to the generator’s owner’s manual for the exact location. Flip the breaker fully off and then back on.
Be sure all loads inside the coach are tuned off before, once again, starting the generator. If all the breakers inside the coach are in their “on” position and likewise, both breakers on the power plant, then I’m afraid further troubleshooting is in order. Perhaps the automatic transfer switching device has malfunctioned, or the generator gremlins are playing tricks again. Either situation demands a more in-depth look.