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 - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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