Onan rotor resistance too low?
6.3NHEFA63753M SN J953443939 nice shiny slip rings, about 60VAC generated, good field flash, 16.6 ohms across terminals 9 and 10 of the regulator connector (with the regulator disconnected.) Time for ...
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Good point and, since it's not broken at the moment, I'll add that to my list of things to check the next time before it fixes itself!
