1) Regardless if the tractor is Pos or Neg grounded, you always jump one battery to another + to + and - to -
2) DO NOT make the final spark producing jump connection near the top of a battery where explosive gasses are present
3) DO NOT jump a 6 volt battery from a 12 volt battery, good way to blow up a battery.
4) I have successfully jumped a 6 volt tractor using a 12 volt battery however, but I ONLY jump the starter motor direct so it and NOT the 6 volt battery nor the 6 volt electrics see 12 volts, ONLY the starter motor. That way I DO NOT jump the battery but only apply voltage to the starter motor.
5) The way I jump start a tractor so there's no sparks near battery top where explosive gasses are present, is to make the final frame/jump ground connection last down away from the battery as far as possible.
6) If you jump a Pos ground tractor with a Neg ground vehicle, still + to + and - to - HOWEVER dont let the tractor and vehicles touch each other.
Im sure I missed a few points so others can add to this
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