I am working on rewiring the rear of my truck since it had a flatbed on it and the wiring left a lot to be desired. I now know through other threads that I have all the wires located and where they go except for a brown wire with a white tracer. I found the plain brown wire for the running lights, green for right turn/brake, yellow for left turn/brake and the red/black wire for reverse lights. This last wire has me confused though. Does anyone know what it goes to?? Thanks in advance

Jon