While most generators were + positive ground, most alternators are the opposite - negative ground, so when an alternator is used to replace a generator the ground polarity of the entire wiring needs to be change to negative ground. When a negative ground alternator is hooked up in a positive ground circuit, the one way diodes in the alternator get fried. By your diagram, if the resistor is fried the diodes are likely fried too.
If the resistor in your circuit diagram is intended to be a ballast resistor to use a 6 volt coil in a 12 volt circuit, the resistor needs to be on the wire between the ignition switch and the coil.
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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 "Replaced by" means the part was superseded.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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