Failed regulators were a popular topic on TalkMorgan during the early years of M3W production. Check this
THREAD out for starters.
Basically it boils down to three points:
- Make sure the regulator has a very good ground connection.
- Move the regulator off the engine so that it doesn't get shaken to death.
- If you want to go the whole hog, replace it with a Harley Davidson type. These appear to be bullet proof.