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We converted an H to 12 volt when I was in grade school. Bypassed the magneto with a 12 volt coil; kept the distributor as is. Replaced a gage or 2. Put in an AC Delco alternator. Replaced the foot activated ignition switch with a keyed switch. The starter was up for 12 volts in this case. Still runs ~ 30 years later. Don't think it's positive ground anymore, but it's been a long time. Why do you need to keep it positive ground?

A lot of the old tractors with the magneto had spring loaded kill switches. Supposedly, with positive ground, they could spontaneously start when struck by lightning. They were usually left in gear to keep them from rolling.