First of all what year coach do you have?
Most Newells have a large enough generator to power everything in the coach.
No the engine alternator usually will not run the a/cs, besides you would need a large inverter to run the a/cs. Very few Newells are set up like this.
Depending on what year coach you have you should have a set of up to 6 8D batteries which would run everything except your a/cs for overnight or longer before needing to be charged from either the engine alternator (if driving) or the generator/inverter combo.
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