Welcome to iRV2. The answer to your question may be unique to your Brand of coach. Consider going to the iRV2 main page and scrolling down to the owner's corner. There you will find a Gulfstream owner's forum. Someone who owns a rig just like yours can readily answer the question.
The OP is a bit confusing. There is generator power to the A/C units but when checking the generator breaker there is no power. Did I read the OP correctly?
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours