What is what...

I am trying to learn here. My headlights and park lamp wires in my 72 Demon. The car wiring is gutted. So I can not hook up power to figure it out that way.

The headlights have the violet w/ white tracer, red, and a black w/ brown tracer. What is the black w/ brown tracer for?

The park lamp plug has four wires coming from it. 2 black which I am guessing are grounds as they went to the inner fender. A black w/ a green tracer and a black w/ a yellow tracer. Is one of these for the turn signal and one for running lights? Any idea which is which or does that not matter? I have the full wiring diagram but my inexperience isn't helping my case.

Thanks ahead of time for any help!!