Harness Identification?

I think I've found it Scotty. Since that was in the underhood wiring box, I'm thinking that it could be the front turn signal wire, as seen in these pics running under the lip of the radiator support. It appears on this 64 to plug into the harness of each turn signal pod in the front grille, with the shorter of the 2 runs connected to the drivers side of the harness. Could this be the harness you have?? Mock it up and see and report back!!

Hope this helps, Geof