[bugman]

I'd just get a test light or volt/ohm meter and go to work on them.

Turn the lights one and prob them until you find one with voltage or lights up the test light.

Then turn the right turn signal on and do the same thing along with the left turn signal.

It would just be a process of elimination.

I doubt that factory color codes would help much since it sounds like it was a upfitters box that you took off and they may follow their own color code.