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I have had a couple rebuilt by a starter repair shop, fairly cheap, as I didn’t have the parts nor the knowledge to do it.
If you cross polarize the battery cables by mistake, you will need to re polarize the generator. TO do this, jump the ARM post on the regulator, to the BAT post on the regulator, but DO NOT TOUCH THE FLD post or you will damage the regulator.
Fairly easy to test when installed with a voltmeter at the battery. Your battery at rest should read about 12.65 volts.
When running the motor, above 3500 RPMS, the voltmeter should read between the 12.65 volts and about 15 volts. Your ammeter on your panel will be around 10 amps, and should decrease as the voltage climbs. Anything other than this needs further troubleshooting. We can get to that if need be.