1999 Grand Marquis - wipers worked one day, not next. Fuse not blown. Washer works. what is likely problem?

Check your fuse cluster(s) for open fuse (s).

Check for a blown fuse first. If they were stuck, the motor would have overheated and blown the fuse potentially, to protect the motor.

You need to take the plastic cowls off that cover the wiper arm linkage and wiper transmission to inspect it...cowl is held on with 3 Phillips screws near windshield and some one inch wide metal clips, take off the gasket that fits on top. If both are not working check the transmission where linkages attach, if one wiper blade is not working it is usually the drivers side where the nylon bushing that forns a ball/socket sort of connection fails due to build up of debris and the rusting of parts that follows, let me know if this helps.

Either the fuse is blown or you have a bad wiper motor.

locate the fuse (owners manual will give location) and visually inspect it if it is blown you will be able to see a break in the metal in the fuse

check fuses if not that look for a short in the wiring near the wiper motor if you dont find one you probably need a new wiper motor,

Check the fuses first make sure its not blown next make sure you have voltage to that fuse if you do and the fuse is not blown I would say change out the wiper switch.

seems like you might have a bare wire somewhere or a bad cluster

Intermittent wiper control stopped working on my 1996 GM last spring. I ended up replacing the wiper motor ($100.00 part). Since I have found it on Amazon for $58 including shipping. It works fine now. Only bad part was all the "stuff" that has to come out (like dead leaves!) to get to the wiper motor. Also make sure you have your wipers in the down position when you replace the motor.
Hutch50

Its the intermittant/park relay.