I agree with Ken, Sounds to me it's the transfer switch assuming you have one. The transfer switch defaults to shore power. There is no power needed on the contactor coils of the transfer switch to pass the shore power to the coach. When the generator is started, the power from it energizes the contactor coils and the transfer switch now transfers the incoming power from the generator to the coach. You will need to open the transfer switch and with a volt meter measure the incoming generator voltage and the output into your newell. If you have power from the generator and the transfer switch does not put power into the coach (load side of transfer switch) you have a bad transfer switch.
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