In This Library about 4, 5, 6, and 7 way tailer wiring diagram harness. You can find image basic diagram for help your problem. Any way if you do not find image for you need may be you check on image gallery. Because the plaweb blog have more than 20 plus image about Trailer Wiring Diagram with 7 way, 6 way, 5 way for plug diagram.
You can find about detail schematic diagram for taillights pin, brake pin, aux pin, turn right and left pin, battery pin, ground pin on plug. In every wire available color like black, red, green, yellow and other. On above image easy to use for finished your project or solution your troubleshooting .