Wipers will not park on 93 ford crown victoria

Use vinegar to unfreeze

the linkage between the wiper motor and the wiper arms needs to be replaced. the stud on the one side is stripped and that is why it doesn't work as it should. this happens usually when the wipers are left on in the winter with the blades freezing to the windsheild. turn on the car with frozen blades tends to strip out the teeth holding the wiper arms onto the linkage

DISCONNECT WIPER SWITCH IF WIPERS STOP REPLACE SWITCH.IF WIPERS DONT STOP. YOU HAVE A DEFECTIVE LIMIT SWITCH IN MOTOR.

replace the wiper motor, the park position is broken, need to replace complete wiper motor.

Looks like the wiper motor uses G102 as the grounding point, should be close to the fuse box in the engine compartment. If you lift it and it stops then you may have a bad switch in the motor.

You need a new multi function switch IE wipers high/low beam headlights, Your next clue will be no low beam headlights when needed

Fuse no. 7(10amp) in interior fuse panel and fuse no.110 (30amp) in underhood fuse panel

In cold weather, ice sometimes forms in the lower curvred area below one of the wipes, which prevents the arm from returning. This can happen if the car was been shut off with the wipers up. You will need to raise the hood to see into the wiper crank rod cavity.

It is also possible for nuts or debris to fall into that same cavity and cause similar symptoms. In the case of debris, the wipers may operate, but may hesitate or stop when the debris or nut is encountered.
In such case, "donot" continue to operate the wipers as the resultent damages are costly & repairs will not be necessary if the debris is removed promptly.
P.S. Do not force the wiper arms. lef

It's probably going to be the switch arm itself.

The part is a bit pricey, but it does come with the wiring diagram to place the new one in there.

The switch is the whole thing, turn signal, wipers, etc, and the arm.

This means that either the switch on the column is bad. It is that, or, the wiper motor is bad.