On the 3 wire 10SI Family of Alternators the 2/F small (that 2 terminal white plastic connector in picture) side terminal is VOLTAGE SENSE. It needs jumped to the big rear main output terminal to sense voltage and therfore correctly regulate charge rate. The other small 1/R terminal is the excitation circuit and requires initial excitation voltage.
IF YOU HAVE THE SMALL 1/R terminal jumped to the rear main output THAT MAY BE YOUR PROBLEM. The 2/F is what's jumped to the big ream main output stud
Is the small white plastic connector installed bass ackwards???? so the two small terminals are on the WRONG terminals???
INSURE 2/F IS WHATS JUMPED TO THE BIG REAR MAIN OUTPUT STUD AND NOT 1/R
OF COURSE the Alternator is most likely NEG ground, you're wired that way correct?????????
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