Try popping off the cover at the bottom of the wiper. There should be a 15mm sized nut(I think). Make sure this nut is tightened down good. If that doesnt work then the linkage has come undone.
top of the fire wall under the hood your wiper arms will connect
There'll be a linkage which connects the two wipers together... that may have come loose or gotten broken otherwise.
The governor for the wipers is located near the fuse box. It is wired to the harness going to the wiper switch.
It is under the coweling, passenger side below the windshield wiper. Some don't have a filter in them for what ever reason, so don't depend on looking for an old one to find the spot.
If the windshield wipers are not working in a 1998 Ford F150, the cause could be a blown fuse. There could also be a problem with the vacuum hoses connected to the wiper motor or the wiper motor itself.
To replace a windshield wiper motor for a 1998 F150, first remove the bottom trim on the window. Then remove both wiper blade assemblies and all screws on the metal cowling. Remove the retaining clip from the wiper motor linkage and pull the controls rods off.
Wiper blade sizes will vary depending on the year of the Ford F150. See sources and related links below to look it up.
Take it to a Ford Dealer.
The 2001 Ford F-150 takes 20" wiper blades on both sides front. See sources and related links below for more information. Since there are over 22 different wiper arm attachments, do not buy wipers just by length only - be sure to lookup exact wiper blade part numbers by vehicle make, model and year for the brand wiper you decide to purchase. This ensures correct length AND correct attachment.
Your windshield wipers were most likely overloaded and blew the fuse, try replacing the fuse. If that does not fix it then it is possible that the wiper motor burned out and will require replacement.
First, remove the windshield wipers. Then you can remove the cowel just in front of the windshield. There are a bunch of screws connecting it to the firewall. Once you remove this, close the hood. Now everything is easily accessible and the rest is intuitive. Replace everything by using the opposite procedure.
passenger side of engine , second cylinder from front is the # 2 cylinder