I had the same problem with my six volt 9N single wire generator the made in the land of the almost right cut out relay would arch when motor was running basically welding the contacts together and the springs were not strong enough to pull them apart. This would put a back feed to the generator and drain the battery. I purchased a full wave bridge rectifier 25 amp 50 volts as suggested by others on this site I plan to put it intomorrow
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