Robert, I went the same route you are contemplating. Used a MD generator on my SM when I restored it. I kept the ground positive so all my wiring is still IAW the original wiring diagram. I scrapped the 6 volt coil and went with 12V. The tractor starts and runs great. The 12V genny keeps the battery fully charged and has no issue when all lights are being used. I would suggest you go with a American made regulator. Brillman sells them. I have had a brillman on my H for over 10 years and now my SM and neither have had issues.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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