I have a 1991 FLSTC. I am attempting to reinstall my front turn signals and running lights. I have the wiring diagram, but it does not match my turn signals. I have three wire signal lights, and the wiring diagram shows only two. The three wire colors are black, violet, and blue. The wiring diagram has 2 black wires.

I realize these are negative, turn, and running. The wires that come out of the headlamp (stock) are 2 blacks, 1 with copper wire, and 1 with silver. There is also a grey wire for the actual running lamp.

How do I hook these up?