IF you have a 30A coach (likely), you do not have enough power available to operate both a/c's simultaneously without the EMS. Attempting to do so will most likely either trip circuit breakers or damage the compressors due to low voltage. Or both.
Bypassing the EMS may work sometimes, but not in a predictable manner.
You should be able to run both a/c's via the generator. It is usually wired to provide a separate power circuit to the rear a/c so both can run.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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