SOURCE: Installing a 7-pin trailer towing recptical on a 1991 Ford F150.
I believe you can look up the manufacturer of the trailer plug kit and find the wiring diagram there. On alot of the trailer plug kits, they have pics and diagrams in the package. The 7 pin plug (truck side) is available with the pig tail set up that plugs directly into the wiring harness for the lights. Then all you would have to worry about is the 2 wires for the electric brakes.
SOURCE: Wiring diagram
If you are going from a 4 pin on your trailer to the 7 pin on the truck. You need to go to parts store or a department store (ex Wal Mart) and look in trailer section and find the adapter. Thats what I did. Also Remember if your lights don't work on trailer, check the plug to make sure its tight or check the fuse under your drivers side rear seat for that fuse box.
SOURCE: need a wiring diagram for both these pickup(not audio)
what part of wiring diagram ? and i might be able to email it to ya
SOURCE: I have 04 ram 3500 diesel. 7 pin trailer connector
Usually the electronic brake wire is blue and the battery charging wire is either red or black.
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