I have a 1963 Ford Industrial 4000 with the 172 engine. It has a heat-sensitive external ignition resistor. When cold it has little resistance. When hot it gets high resistance. Works like a voltage regulator. Sends near full batery voltage when cranking and when the engine is hot and less ignition power is needed - it increases resistance. This sort of heat-sensitive resistor is common on American made four-cylinder Fords. If turn the key on and do start the engine - in a few minutes smoke will come off that resistor because it gets so hot (without the engine running). That is normal. Seems everytime someone asks a question around here about coils -the answers go wild and then much is declard bogus because "Billy Bob or Bubbs" chimed in. Well - #1 I own a 63 4000 Industrial. Had it for near 30 years. It needs a minimum of 9 volts at the coil primary to work correctly (where the IGN wire hooks to it). If you have at least 9 volts and it does not run right -you've got problems unrelated to any resistor in the wiring.
Note that any 12 volt system is designed to work well at 9 volts and not just a Ford. A 12 volt system is designed to make good spark from 9 volts to 14 volts.
A coil that does not need an extra resistor in the outside wiring already has extra windings of wire inside to make that extra resistance. Easy to measure with an ohm-meter.
You can go to NAPA and buy a coil with the built- in extra resistance and it will say on it (not for use with external resistor). That will work fine. Or you can buy a coil that requires and outside resistor and it can be used on a 6 volt or 12 volt tractor.
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