How can I tell if my crown victoria motor mounts are broken

basically pull the motor off the mount
if it is broken then the mount will part
inspection will reveal a shiny part of metal where the rubber is rubbing on the steel

start the car and with the brakes applied put trans in forward gear and push on the throttle and if the engine raises the mount on the side the engine raises is the side the mount is broken. then put it in reverse and do the same thing if the engine raises then that mount is broken.

Raise car put on stands. Jack engine slightly toward one side and inspect mount. Do same for other side.

I can only forewarn you about several things to watch for in hope of providing you with something to prevent you from breaking something.
You must also consider loosening the transmission mounts to free up the entire drivetrain. There may be some clearance problems at the rear of the motor and the Radiator hoses may not stretch, nor may the fixed A/C lines to the front A/C cooler allow much travel space.
The oil pan is not a lifting point, nor is the crankshaft pulley. The exhaust system is not flexible either.
Your best bet is to look at the actual motor mount and see whether the mount is flush or has protruding studs. Flush shaped will be easier to handle. An 1/4 inch of clearance would allow you to slide parts through the opening.
You could still get another Expert to answer. I owned a 1994 Crown Vic and was underneath it many times, but never changed a motor mount on it.

It sounds like the power window motor is still running but you have a problem with the regulator arm. If you remove the door trim panel and water shield you can have a look to see where it has been disconnected from the motor or if the regulator arm itself is broken.

For 1995 Ford Crown Victoria 4.6L SFI 8cyl, the Flasher is located: Front seating area, driver side, under dash, driver side of pedal support bracket, mounted in fuse panel.

Hope helps with this.

Follow the Dark Blue/White wire or Brown/White wire from the Multifunction Switch to the wiper module according to the schematic.
Also, one can trace the wires from the windshield wiper motor to the wiper module by peeling away the wiring loom and looking for a Yellow/Red wire that leads to the module.
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Windshield Wiper Motor Removal & Installation To Remove:

1. Remove the mounting arm and pivot shaft assembly.
2. Remove the windshield wiper motor cover.
3. Remove the clip.
4. Disconnect wiper transmission linkage.
5. Remove the bolts.
6. Remove the motor.

To Install:

1. Position the wiper motor.
2. Install bolts. Tighten to 10 Nm (89 in. lbs.).
3. Connect wiper transmission linkage.
4. Install clip.
5. Install wiper motor cover.
6. Install mounting and pivot shaft assembly.

Check the fuse and wiring to the motor with a multimeter or test light while trying to operate power windows.

Take the panel off first to get at the motor to test for current.

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

Check the frame crossmember at the mount. If it looks like the crossmember can be unbolted, it should be a simple job. You would remove the crossmember while supporting the tailshaft. Then unbolt the trans mount from the transmission, change out the parts and reinstall. Or have a shop put it on a lift and change it out in less than an hour.