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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Today's Featured Article - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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