the pulley is 3 inches. And i forgot to say it was a 10si alternator.
rough calculations and quick measurements indicate at 500 engine rpm = 975 alt rpm 800 eng rpm = 1560 alt rpm 1000 eng rpm = 1950 alt rpm 1500 eng rpm = 2925 alt rpm 1600 eng rpm = 3120 alt rpm
looks like this particular version needs to spin around 2000 rpm to excite.
I may get my core back then talk to the alternator shop and get the right regulator to make that one work for my needs.
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