I do know that if you can get to the field coils, you can test for open's, which are what would cause the voltage to be low. Is there a charging circuit off of it the you could put a voltmeter on and see what the voltage is while the engine is running. It would be nice if we knew what it needs to be, but I would guess that if you have a bad field coil then it would be around 11 volts max, reved up above 2000rpm. Or a blown rectifier, would put you under 6 volts, if it has one.
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