It sounds like the AC unit is not getting any power from the generator. You also did not tell me if your other 120 volt appliances and outlets are working on generator power. So I am going to have to give you some general areas to look at.
The first thing I would do is go into the generator compartment of your motorhome and look at the circuit breakers on the generator itself. You might find a tripped circuit breaker on the generator.
I would also go into the electrical compartment of your motorhome and check all of the other Circuit breakers.
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