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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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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