I have a 1986 f-150 4x4, standard, 300 6cyl, dual tanks. I need to replace the wiring harness due to a fire...mine is colored "orange"...I can't seem to find any 4x4 wiring harnesses....what do the colors signify? What is the diffence between the "blue" harness or the "yellow" harness or the "orange" harness? Any ideas or links are greatly appreciated..thank you