hi I"m still new to these type of engines too, plenty of experience in lawn mower and go cart type motors, but I would say with the engine running you should be able to test the voltage at the battery with a volt meter and see what kind of voltage you are getting there. it should read anywhere between 13.5 to 14.5 volts. Besides as cheap as the voltage regulators are why not buy one and put it on? they just plug in. easy to replace. zman If I am wrong someone please say so.
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