Are you sure it's not already 12v negative ground? MF35's were all 12v, negative ground to my knowledge.
A 6v generator will struggle to maintain 12 volts. Generators are not polarity sensitive, but need to be polarized when installed. Some regulators are polarity sensitive. The new aftermarket regulators are usually short lived and troublesome.
There are alternators with a tach drive if you want to keep the tach working, they just cost a more.
If you are looking for dependability, the alternator conversion is the best choice.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
... [Read Article]
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