I am looking for a tow plug w/harness, for a 1997 lariat. My plug was missing when I purchased truck. There is factory wires where the plug shuold be, but they are just cut off and dangling.Any advice or direction to go? Thanks ahead of time.

 

I had a similiar problem with my '98. I just extended the existing wiring, and wired it to the plug of choice (I used the 7 blade RV). Very easy to do. The wires are as follows:
For the 7 blade RV:
Pin 1/White attaches to the white wire = ground
Pin 2/Blue attaches to the blue wire = brake control
Pin 3/Green attaches to the brown wire with white stripe = running lights
Pin 4/Black attaches to the orange wire = battery charge to trailer
Pin 5/Red attaches to the yellow wire = left turn signal/brakes
Pin 6/Brown attaches to the green wire = right turn signal/brakes
Pin 7 (centre of plug) attaches to the black wire with the green stripe = backup lights

4 wire trailer:
White attaches to the white wire = ground
Green attaches to the brown wire with white stripe = running lights
Red attaches to the yellow wire = left turn signal/brakes
Brown attaches to the green wire = right turn signal/brakes

Hope this helps.