This is a "how come" question.
Lots of the larger one cylinder engines used in Lawn and Garden Tractors in the 1970s and 80s used a Starter-Generator. It works as starter, and once the engine is running, it produces current like a generator. Basically they are 12V DC generators. The weak point seems to be the mechanical voltage regulartors that were used.
My question is simple--how come no one has designed or modified a solid state regulator to replace the mechanical ones? I know there isn't enough volume for commercial interest, but surely someone can design a schematic using solid state components that can do the job and be more reliable.
Any other old tractor people here have any idea how this could be done?

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags