7 Pin Trailer Plug Truck Side. There is a lot wiring that you have to tie into your truck's wiring harness, but it is easier to do than it seems. HOWEVER, the connector that plugs into the OEM harness on your truck is different.
When I first got there I swear every truck and most trailers were all wired in a different configuration.
Having the various pinout diagrams available is vital to troubleshooting and/or repairing truck and trailer wiring.
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On my trailer, I can't get marking lights to go on. Can anyone confirm that there is no pin that has a constant charge to make this happen. Note that although the colors and wire sizes.