What this resistor does is it allows enough current from the ignition switch to flow thru the alternator to excite it. But once the alternator starts charging it back feeds current thru this resistor to the ignition switch but this resistor cuts the current down low enough so when you turn the ignition switch off the engine will shut off. With out the resistor enough current would be back fed up to the ignition switch to feed the ignition circuit and not let the engine shut off.
Best way to wire in this wire to excite the alternator is to wire it to the accessory terminal on the ignition switch not the ignition terminal. You won't need a diode, idiot light or resistor then.
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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 "Replaced by" means the part was superseded.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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