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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