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Good Morning Michael, Your tractor came from the factory as positive ground, but the new generator will charge either ground system PROVIDED the Voltage Regulator is a type that will work either way OR is a neg grnd and you remain neg grnd OR you re-configure the battery to the type VR you have. Once its all connected and wired and youre sure the new VR will work either pos or neg grnd., (many will and many are neg grnd only, which is what you now have anyhow) you need to polarize it by momentarily jumping a wire form the regulator's BAT terminal over to its GEN or ARM (whichever its labeled) and it should yield a small spark and then youre done. If the ammeter reads backwards, reverse its leads. We need to know if you have an internal or external coil ballast resistor to advise how to wire the coil, because if its got an external ballst resistor and is now neg ground, the little neg coil terminal should go to the distributor and the lil + terminal get battery power. Look on the pedestal for a white ceramic resistor. Thats an external coil ballast. Also if it has that, the voltage on the coils input when switch is on should read in the 6 to 8 volt and NOT 12 range. Hook her up and polarize it and see what the ammeter does and if shes charging, and if not, post back as much info as you can muster up and we will further advise. God Luck n God Bless Ol John T Nordhoff in Indiana
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