If your tractor already has a ballast resistor use a 6 volt coil.
I think 6 volt coils have 1.5 ohms of resistance across the primary terminals and use a high amp 1.5 ohm ballat resistor. Twelve volt coils have 3 ohm resistance across the primary coils. Measure the resistance of your old coil and buy one with the same resistance.
The advantage of a 6 volt coil and a ballast resistor is most vehicles add a starting circuit for a hotter spark when starting. An extra wire runs from the switched terminal on the starter solenoid to the hot terminal on the coil, (or the coil side of the ballast resistor). When the starter is engaged the extra wire sends full battery voltage to the coil for a hotter spark. Once the starter is disengaged the coils receives 6 volts from the ballast resistor for longer point and coil life.
The starting circuit helps most in cold weather or with a low battery.
If you use a 12 volt coil with a ballast resistor and starter circuit the engine starts well but as soon as the starter is released it runs poorly from lack of spark.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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