Air Conditioner/Generator/Electrical question

[edanddoris]

Hello, this is our first post to this forum. We have a 2004 Gulfstream Crescendo, Deisel motor home. We recently went on our first cross country trip from Washington State to Raleigh, NC. Everyone made it safe and sound. The motor home handled well with the exception of the generator. I'm hoping someone can help me figure out what is wrong or what I'm doing wrong.

When the motor home is on the road (in motion), and we turn the generator on, we are not getting any electricity. (we were trying to run our airconditoner) No other electrical outlets worked either.

When the motor home is parked and the engine is off, we don't have any problems with generator power. All outlets work as usual.

Thanks in advance for any help or information you all may provide!

Ed and Doris