The nut that holds the wiper in place might be loose. check under the plastic cover at the end of the wiper arm where it mounts to the back door.
You can find your 1999 Ford Expedition front windshield wiper fuse in the fuse box. The windshield wiper fuse will be in the second column, fourth from the top.
Could be he wiper motter or the fuse.
2000 expedition wipers & radio don't work when in drive
The 1998 Ford Expedition had a mid-year production change which affected the wiper system. See sources and related links below for the best explanation of how to determine correct wipers.
The 2008 Ford Expedition wiper blade sizes are 22" wiper blades on both sides front and a 16" rear wiper. 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.
The 2007 Ford Expedition wiper blade sizes are 20" wiper blades on both sides front and a 17" rear wiper. 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.
The 1999 Ford Expedition takes 20" wiper blades on both sides front and a 16" rear wiper. See sources and related links below for more information. Since there are currently 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.
The 2004 Ford Expedition takes 20" wiper blades on both sides front and a 17" rear wiper. 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.
The 2001 Ford Expedition takes 20" wiper blades on both sides front and a 16" rear wiper. 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.
The 1999 Oldsmobile wiper switch can be located below the dashboard. The wiper relay switch simply plugs in and out.
On a 2000 Ford Expedition : The rear windshield wiper control is on the inner part of your turn signal lever towards the steering wheel column cover . It has OFF / INT 1 / INT 2 positions
Yes, it has happened to me with my 2007 Ford Expedition. If the wiper is siezed in a position other than the normally off position, the motor will continue to strain to return to the off position. If this happens to you, make sure the rear wiper is turned off, then open the glass in the rear liftgate. This will disengage the motor from the wiper, and the motor should rotate counterclockwise to the off position. If the rear wiper is not too siezed, you should be able to manually move the wiper back to its off position before closing the rear glass. This will align the wiper drive pin on the inside of the glass with the drive slot in the motor. These need to be aligned to be able to close the glass. The faulty wiper arm assembly will likely need replacing.