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Hello, my name is ***** ***** I am going to assist you with this.
If the genset is running, it is producing voltage. If it really were only putting out 20 volts, it would be shutting down with a code 12.
Where exactly are you trying to measure voltage at?
Have you checked your meter against a known power source to make sure the meter is not malfunctioning?
Are you sure you are testing on the input side of the breaker, and not on the output side?
It is sounding like you have a bad stator.
To test it, you must be able to remove the top cover, and this usuallymeans having to remove the genset from the coach.
Can you get the top cover off, or do you have the capability/facility to remove the genset?
No, you must be able to remove both of the stator plugs, and get down inside for testing.
With the stator unplugged, it will not start.
But I recommend leaving it out until it is done - and this means bench testing it once repairs are made.
I have uploaded instructions on testing the stator. Click here to download the instructions.
You state that you are not getting voltage to the circuit breaker. But as I said, if the genset is not producing power, it would shut itself down. So the controller is seeing voltage from somewhere, and it sees reference voltage from a different winding in the stator than the power windings.
Yes, you check from the hot leg to neutral.
Have you checked on this yet?