Many vintage 6 volt tractors have only a cutout on the generator (usually round can) and a third brush to regulate the current. They are more variable voltage, but WILL overcharge the battery on a long run unless the operator turns on the lights to absorb the extra current from the generator when the battery has had time enough to be fully charged. That manual control of charging probably means a new battery each year if not more often.
In my opinion applying 8 volts to a starter that didn't crank good with 6 volts is kicking a dead horse. As noted below, worn bearings, worn brushes, wimpy (ala walmart battery kiosk) battery cables, and dirty battery circuit connections will keep a starter from working well at 6 volts, but applying 8 or 12 volts will only finish the destruction of the starter more rapidly.
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Today's Featured Article - Show Coverage: The Old Gold National Antique Tractor Show - by Cindy Ladage. Over the fourth of July weekend, the Illinois State Fairgrounds in Springfield, Illinois, was the site of the Old Gold National Antique Tractor Show. Tractors of all makes and models were displayed and separted into categories by their age. Deere, Oliver and even a Wards and Keck Gonerman were part of the crowd. A sea of red International Harvester's seemed to be the the model with the biggest showing. The crowd was decent for the scorching July heat. The opening day started o
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