Just bought a '99 2500 with factory trailer wiring but the plug is missing i just have 8 random wires hanging down under the truck. I bought a 7 round generic female plug in but it only has 7 places to connect wires to. i know i can find tail lights, stop, reverse, turn with a tester but what about brakes and aux? does anyone have the color chart for the wires and know where the 8th wires goes?

 

http://www.etrailer.com/faq-wiring.aspx
Check this out .

Dave

 

Thanks, my wire colors are different and that still does not explain the 8th wire?? I am still just as lost. Thanks for the help though I am going to bookmark that for the future!

 

could the 8th wire be a ground? and instead of going to the plug it grounds to the trailer tongue? kinda like a chassis ground?

 

What colors do you have?

Dave

 

If you look through the FAQ section, you will find a download for the FSM ( factory service manual) that has excellent wiring diagrams in it.