Run a jumper wire from the battery to the coil and see what happens. Something tells me the coil is getting its juice through the resistor while you are cranking it over. It will still have spark but not enough to start it in this cold weather if the coil is getting power only through the resistor. The resistor gives the coil 6 or 7 volts and that is all it needs to run but to start the engine the coil needs the extra oomph from 12 volts to overcome the voltage lost from the starter draw. It should be shunting 12 volts to the coil automatically when you hit the starter but a wire or switch might be bad and the shunting isn't happening. Give it a try. This still might not be the problem but the jumper wire is worth a try.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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