I used to use an old scholl alternator rebuilder with a shop in the shed in the back yard. He claimed stock Mitsu voltage regulators were marginal, and all the aftermarket he had seen were just time bombs waiting to blow. I don't have his experience, but nothing he ever built for me failed, so I trust his ideas.

Over and above that, this is 'lectron stuff, and I'm still stuck in hole theory...

Not responsible for advice not taken...