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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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