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Ah, I missed when you originally posted. Yes, it should be a 3-groove, with one crank>alt>WP>crank and two parallel (matched pair and sold that way) from crank>WP>AC>crank. There was a mid-year change IIRC that used a smaller alt sheave (same diameter as your single was) and 2 larger AC sheaves on the crank to spin the AC faster, and it was routed direct, crank>AC>crank. If you still have your single-groove crank pulley, I'd be interested. I may have the later 3-groove AC crank pulley to trade if you still need it.
David
David
