Funky alternator wiring- '73 Duster

Interesting that I just read this. I have on too on my '74 Duster. I am still using the slant 6 wiring on the v8. There is a black hot wire that is in about the same location as yours. I too thought it was to be for the alt, but its not. It has been capped off for a long time. My car was never a A/C car, and this is in the factory harness.. no one added it in. I havent found it on any of the old wiring diagrams either. I have no clue what else would need a constant hot lead.... so its tucked in the harness for now.

-RPM