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For the (VERY LITTLE) it’s worth, for **12V** regulators, I have a bookmark for an old incarnation of the blue board from January 2012:
Altenator on 33 hp evinrude
I have tested an inexpensive solid state voltage regulator for a Harley on my bench test setup using a Prestolite 4008M 12V generator. The solid state regulator is a 12V regulator and has a 10A current limit to protect the generator. The older Harley 12V generators are also a 12V, 10A unit with the same internal field connections as the Pretolite generators OMC used. I got it from J&P Cycles, Part number 381-309 and it was $49.99 plus shipping.
Which may still be available: https://www.jpcycles.com/product/381-309/v-twin-manufacturing-solid-state-voltage-regulator-for-12-volt-generators
It’s solid state (so it can’t get rusty, but may inexplicably and irreparably stop working at any time)
http://www.omc-boats.org
http://www.aerocraft-boats.org