Here you go... I just did this on my '01.
Takes all of about $35. 00 and 1 hour to do.
You need to take a ride to your local Ford dealer. (keep comments to yourself) And purchase this relay... F5RZ-14B118-A.
Remove door panel on pass. door. Locate the wire that shows 12V when putting the window down. (was purple on my truck) This was in a connector close to the window motor.
Locate a wire in the harness near the switch that shows 12V with the key turned on. (this was red in my truck)
Where a wire harness connector would connect to the relay there are 4 tabs numbered 1,2,3, and 5.
1 goes to ground, I grounded this wire right to the door. 2 will go to the 12V wire you found in the harness near the switch.
Now you need to cut the wire that shows 12V when putting the window down. Tab #3 will connect to the end away from the motor, and tab 5 will connect to the motor side of that wire.
That's it...
And the beauty of this relay is that it can be mounted inside the door... so no having to run wires through the door jamb boot.
HTH