ok I just got this truck and she is a beast! The windshield wipers don't work. they squirt water on the window but won't wipe. I replaced the fuse and the wiper switch...whats next? Both sides don't move so Im thinking the wiper motors should be ok.

 

As I recall the wiper motor was a real dog to replace. I know in the E series I needed a long extension to get the mounting bolts for the motor way up under the dash. If the F series is the same, you are probably looking at a wiper motor replace job. You can get rebuilt wiper motors from some auto supply stores and they usually do the job. Be careful when removing the retainer clip on the wiper linkage so you don't lose it.
If you can , temporarily hook up the wiring to the replacement motor so it can get to the "Park" position before installing so that when you finish bolting the motor up all you need to do is reconnect the drive linkage to the motor. Both motor and linkage should be in the park position.