the alternator in the photo looks like it has an internal regulator. the regulator in the photo is an ancient "modular" three wire type. your harness should have three wires to the old alt. (not counting the fat red ring terminal main wire) the harness at the old reg. will also have three wires, but one of them will be double, that's the one that connects to the dash indicator, the single spade on the new alt.
83 Spider Veloce
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