I'm trying to convert a 1963 ford c900 from an external regulator to a delco 21si internal regulator alternator. my guestion is, what to do with the fourth terminal that is stamped (R). This alternator has four threaded terminals on the back of it. Battery, ground, ignition, and (R). Thanks for your time.
Optional Information: Pre-
1981
Ford c900 534 gas
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