Those running voltages are too high. Anything above about 14.5 volts against a fully charged battery indicates the internal voltage regulator in the alternator is probably shorted out and producing full field current to the rotor winding all the time. That could also account for the indicator light not going out on shutdown. You probably need to rebuild or replace the alternator, or at least install a new regulator module.

www.ebay.com/itm/190774376868?

Jerry

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