I have noticed this plug hanging ever since I got my truck and have always wondered what it was for. I have looked around and not seen anywhere it was supposed to plug in to. The truck runs just fine but it has always puzzled me. Does anyone have a clue where it goes?
The truck is a 97 2wd Lariat

 

Cant see your pics but bet your talking about the plug for the trailer brake box

 

your pictures are from your email, they need to be hosted on a site like photobucket, or you can create your own gallery here.

Where on the truck is this connector? Size? Shape? How many wires?