Name that wire

I inherited a 1971 Duster with a 318 2bc and the only changes I know my father in law did was change to and electronic ignition system from points. Found this random wire without a home. Anyone know what it is or where it goes. Was hanging by the starter. Engine starts and runs. Has a push on style connector and is black in color in the same wire harness group as the ones running to the starter relay. Just can figure out where it goes.

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