Wiper motor slowly died

If it buzzes or hums at all when you put power to it, it could be just dry bushings in the motor (usually the back one)
I have drilled a small hole in the rear center at the back of the motor housing and put a few drops of oil in there and put a dab of RTV over the hole and had them work fine again for years.
Sometimes the bushing is so worn the motor armature gets off center and stalls the motor.

The drill and oil trick works on some heater blower motors that have dried up bushings also. (though those are usually the bushing at the squirrel cage end where most of the load and open to contamination is, and not at the back of the motor which is closed in)