somebody's customized your charging system. That 4 wire connector with the looping added to it originally went to an externally mounted voltage regulator that was mounted on the firewall. That customization changes the harnessing so you can use an internally regulated alternator on the car. The two prong wire connector would have gone to the old original external regulated alternator. The internal ones use a two wire connector that lays flat side by side, instead of that one that has them vertically side by side in orientation.
normally that two wire plug would have been cut off for the different two wire plug on the newer alternator, did they splice in the other lines further up the harness? Follow the two small wires from the alternator.
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