There are alternatives to buying regulators. 4-5 years ago I found a youtube clip which included circuit drawings to build a universal type regulator. It is a simple circuit to build. I am pretty sure you could double or triple up on the transistors and should be able to run any rotor out there.
This is not the video but it shows a very basic type as a start.https://www.youtube.com/watch?v=BI7oFEcDQzo
I built half a dozen units that could run nippondenso, bosch or even the newer aftermarket branded ones. They can be remotely mounted, so could theoretically be waterprooofed. They work really well. Buggered if I can find them now, though. The expensive bits are the heat sinks and the tube of heat conducting paste.
The ones I built included the trio of small diodes, so it was just a matter of soldering or connecting to the windings and the brushes. I will have another search tomorrow.
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