Oh, yes there was. Virtually all American cars and trucks used external resistors. And, because all kinds of part numbers have been combined, you can't get a tractor/vehicle specific coil any more. You have to know what you're getting. Easy to measure with an ohm meter, although I've never seen a 12 volt coil that, if it has an internal resistor, that does not have it stamped on the coil. With large engines, back in the 50s/60s when 12 volt systems became common, they needed an external resistor with a ignition by pass circuit. Starter solenoids of that era have 2 small studs, one from the ignition to energize the solenoid and one going from the 2nd stud to the coil. GM used a resistor wire and Ford/Chrysler a porcelain type. Voltage drop while cranking is significant, especially in the winter. If you were running only 9 volts thru your resistor there would only be around 6 available for the primary circuit. Even today, a lot of your solenoid replacements have the 2 studs. Again this only relevant because of the rampant part number combinations the bookkeepers have foisted on us. You must have a resistor in a 12 circuit or you will destroy your points in very short order. I taught automotive ag mechanics in the post secondary school system here in MN since 1970 and feel comfortable with what I'm talking about.
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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 "Replaced by" means the part was superseded.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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