67 Barracuda alternator with 2 FLD connections

The PO of this car and his junkyard parts are driving me nuts. He also played with the wiring.

The alt that came with the car has 2 FLD connections. Both had wires, but on this car, that doesn’t mean anything (about to go chase the wires through the harness). The rebuilt alts I see online, my 67 Plymouth shop manual and the Barracuda supplement wiring diagrams only show one FLD on the back of the alt... what is going on?

No numbers left on alt. Any idea if it should have one or two FLD connections (as seen in the photo). Is this normal?
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