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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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