If you have an IGN post on your starter solenoid - sounds like it is being used as a resistor bypass when the engine is cranking. Nothing wrong with that. But when not cranking - power to the coil primary comes from the ignition switch. An external resistor will be in that circuit somewhere.
If you have used coils in your shop -you can determine if they need external resistors by checking resistance across the primaries. If 1 to 1.5 ohms - it needs a resistor if used with a 12 volt system. If high - around 2-4 ohms - NO external resistor is used.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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