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Remove the windshield wiper arm from the windshield wiper motor. Remove the wiring harness. Remove the retaining nut. Reverse the process to install the new windshield wiper motor.
The windshield wiper motor is located just below the windshield wiper blades and is covered by a black panel.
right under the cover that the wiper blades mount to
Under the vin plate. fold the windshield forward.
To replace a wiper motor on a 1994 Toyota Corolla, remove the rubber stopper that cover the hardware attached to the wiper arms. Then grab the wiper arm and jiggle it back and forth until it comes off. Remove the old one and slip the new one on.
Weak battery or alternator output.
My mechanic took about an hour.
You need to replace the wiper motor.
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The 1994 Jeep Grand Cherokee takes 20" replacement windshield wiper blades on both sides front and a 10" or 11" wiper on the rear.
Make sure that the nuts holding the wiper arms are sufficiently tight to ensure that they move when the shaft turns thus moving the wiper arm.
You need to remove the wiper motor and linkage assembly. Then disconnect the motor from the linkage, and turn on the wipers, to see if the motor is running or not. Then when you have the linkage out, manaully move back and forth to see if its binding or not. Usually a bad motor. Unfortunately, MB seems to have many problems with the wiper blade motors.