originally it was a 6v pos ground, however, who knows if it was converted to 12 in the past. couple things to look at that may help id it. first, if it has lights, pull the bulb and see if its 6 or 12v. then see if it has a voltage regulator or cut out relay. if a cut out, 2 wire, its a 6v. if a 3 or 4 wire reg could be 12v, there should be some numbers stamped or inked on it, look for 6 or 12v markings. and look at the genny. if its an alternator, its a 12v, if a genny, more than likely its a 6v, however the genny could be a 12v too. the early 60"s gm 12v gennys will fit on the tractor too, i have 3 tractors with 12v gennys on em. one other thing to chek is the coil. look for a ceramic ballast resistor just before the power at the coil. also see if the + side of the coil goes to the distributor or the - goes to the dist. + to distributor is pos ground, - to the dist is neg ground.
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