If you suspect a polarization issue, put a fully charged battery in it and polarize the generator. All it takes to polarize is a momentary connection between the "BATT" and "A" terminals of the regulator. If you did that and it still doesn't charge, the generator system is easy to test.
Remove the belt from the generator, disconnect the "F" terminal on the generator, and short the "A" and "BATT" terminals together. The generator should spin like a motor. While you have it motoring, ground the "F" terminal. The generator should slow down, but continue to motor. If all of the above checks out, verify the "F" wire is good by passing current through it. I use a headlight bulb for this test. If the bulb lights bright, the wire is good. If everything checks out this far, replace the regulator.
If the generator didn't motor in the first test, try using jumper cables to go from the NEG battery post (positive ground) to the "A" terminal on the generator. If the generator still doesn't motor, it will need to be removed and checked for worn/stuck brushes, or other internal faults.
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