What are the plugs for that are mounted to the lower rear of the fender well on both sides(right near where front mud flaps go) The appear to be like a 3 wire plug.
Jerrod '00 cc powerstroke

 

They're for the front ABS sensors in the hub. If you had that option that harness would continue down to the hubs right along side the brake hose. I woundered the same thing when i saw those plugs on my truck. Figured it out when i saw a truck with 4 Wheel ABS.

Nelson