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I agree with Ted. I had similar problems with my 2021 Axis and the Onan 4000 generator. I measured the voltage at the solenoid terminal where the starting power ties in to the generator. It showed 12+ volts. I then jumpered from that terminal to the starter and it cranked. I then jumpered the solenoid itself and it also cranked.
I concluded that the problem was internal to the generator and with the solenoid and starter working, it was probably a problem with the control module as Ted notes above. I took the RV to a Cummins Service Center about two hours away.
They concurred and replaced the electronic module and it started fine. Make sure you get it fixed within Cummins 2 yr warrant period, otherwise you are looking at $1,000.
David
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