No over voltage in 10 yrs. now. Did have some intermittent low voltage over the years. It would show one alternator off and voltage would drop a little. That was fixed a year ago when an alternator drive failed in the rear engine. I take some credit for finding out how to adjust the voltage regulator and working with an A&P adjust it - problem is gone. I got to believe that the droping on and off due to poor voltage adjustment helped fail the alternator drive.
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