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I had a brush that was cracked and the diagnosis was rotor and/or stator. $13 versus about $2800. Long time generator tech at Cummins Ocala. Unless you have the r/s out and in pieces I would try brushes first.
Basically the brain has to sense a/c voltage within seconds to continue to run or it shuts down. Bad/broken brushes may give enough juice to start but not enough to
tell it to continue running. Then it throws a code for $$$$.
Good Luck...and if the bill gets big be sure to join Cummins Power Club...$20 could save you several hundred on a r/s repair.