I will add to this informative thread that you could have an alternator, not a generator. An alternator will (likely) be aluminum and rather blocky in appearance. A generator will be cylindrical and rather long, 7 inches or so. If it is an alternator, none of the information below about the drain is valid. A magneto is still not connected at all to the electrical system, so that is correct. (it also assumes you actually have a magneto)
Do this if it has an alternator. After rrunning it, or charging the battery, remove the big wire from the alternator (carefully as it is a 12 volt hot wire) and put a test light between it and the stud you took it off of. If the test light glows even a little, that alternator is in need of repair. If it is bright, it probably has a bad diode in the output bridge. Good luck, Jim
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