I have a 1991 Ford F250 where I'm trying to track down and replace bad wiring. I keep blowing the fusible link for the trailer running lights. I've replaced a lot of wiring, but I found more problems, at the back of the connector.

I took a look at the back of the connector where the wires go in, and started inspecting them, looking through them. I pulled a wire and it's like it fell off or something. I'm colorblind, but it looks red with a white stripe on it. There are "8" wires going into the 7 wire connector! I took apart the connector and yeah, some of these wires have like 2 strands still hangin on the connector. But I cannot find where this 8th wire went? There appears to be another red wire with a white stripe on it. I plan on taking apart and cleaning/repairing this connector.... but what's with this extra wire? Where does it go?

 

What I might consider doing is going to say a walmart and getting a new 7 pin connector ?
not expensive and bet they have instructions with it

then you don't have to clean the old either ! good luck

 

From the tech folder:

https://www.ford-trucks.com/forums/5...g-diagram.html

Yellow = Left turn
Green = Right turn
Brown = Tail/Marker
Blue = Trailer Brakes
Black = +12 volt source (ie breakaway battery charge)
Orange = Backup/Auxillary
White = Ground

 

But why are there 8 wires going to the plug? Anyone else's like this?

 

Are all 8 connected inside the plug? Lots of times I've bought multi-wire cables just to use whatever I needed. 8 wire is easier to find than 7 wire.