The resistor is to prevent substantial current from flowing into the alternator from the ignition in the case that the alternator's internal regulator shorts out. It is a bit redundant in that the resistor alone will work to allow excitation. I have not seen any (nor heard of any) shorted to ground regulators that cause the issue above, so I don't recommend te use of both. But I have no issue with a marker lamp, diode, or resistor at or above 10 ohms being used to limit back feeding the ignition. Jim
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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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