rmerrittjr, what make and model motorhome do you have? With that information we can probably tell you if the chassis battery is supposed to be charging while you are on shore power. Some do and some don't.
Since you say your aux start function from the aux batteries doesn't function either, I think you may have a defective Aux Start/Charge/Isolation solenoid.
In any event, you either have a very weak chassis (starting) battery or you have a fairly large unidentified drain on it.
Looking forward to your response.