7 pin wire harness confusion

[RexJ]

I have a 2004 5.7 hemi that has a brake controller and 7 pin plug spot on the back that looks to be factory. When I got the truck the physical connection point was long gone and it was just a mangled set of wires and the back end of the connector stuffed in the bumper (the previous owner did a number on a lot of things on this truck)

Trying to save myself a few bucks I pulled what I thought to be the right connector/harness setup from another dodge at the wrecker (can't remember the year but it was the same gen) but the wiring is just making no sense to me.

I've attached a few pics - the wire bundle coming off the truck (blue, brown, red, white, black, green) the harness connector I pulled from the wrecker (red, black, black, yellow, green, green/white, green, grey?) and the connector the plugs into the back of the 7 pin. I know there is also a yellow and white stuffed up under the truck separate from the rest of the bundle as well.

Any help is appreciated

 

[hemihustlin]

Cut the tape back more towards the truck, who knows maybe its spliced up higher and you dont see it now. Also get a wiring diagram for your truck/trailer lights system so at worst you can just do it manually.

This seems like a good site for info
https://www.etrailer.com/faq-wiring.aspx

 

[Smokeybear01]

Looks to me like it's time to pull out the ohm/volt meter and start with figuring out one wire at a time and ignore the colors then get some good water proof connectors and shrink wrap and go for it. Unless your goal is to get it back to factory. Then I would get me a wiring diagram and go from there. Good luck. BTW- and you're probably already aware of this, each pin in the connector housing has a distinct purpose (brake light, turn signal, etc) and it's a universal setup so that all trailers use the same connections for the same purposes. That diagram is easy to find online and I use it all the time for wiring connectors and trailers. Hope that helps, but like I said, you probably already know all that.