Repair wiper linkage

Try this test. With the key OUT of the ignition stand outside the vehicle, reach out and try to move the broken wiper blade by hand. Does it move with no resistance? Does it feel like 'clicking' as you move it? Does the other wiperblade move slightly as you move it or does it not move at all?
This will help work out if it is the wiper arm slipping on it's drive spindle or if the problem is deeper down underneath in the rods and arms moving the wiperblades. Please comment below with this information and I'll try to help you more.

Here's a Autozone repair guide on your wiper motor Charlie. Repair Guides Windshield Wipers Wiper Motor AutoZone com

First, you should find a repair manual or even look for a YouTube video that displays the mechanism. Generally, a single electric motor drives the two wipers through interconnected links and pivots. If one side works and the other doesn't, or only provides a partial movement of the wiper blade, it is possible the linkages have disassembled for some reason. It doesn't seem that you will need a new motor. Instead, a pivot joint could have become disconnected or simply dislodged. Or the plastic pivot may have broken after 14 years of use. In any case, you will have to figure out how to find and examine the linkages to fully understand what needs replacing or repairing. You could also stop by an auto parts store and ask to see a new linkage mechanism. It may come as a complete package along with a new motor, in which case you will also end up with a new electric motor as part of the repair.

Either the wiper arms are loose or stripped on the pivots or the wiper linkage is broken. Try tightening the arm to pivot bolt. If that doesn't work, remove the plastic cowling and examine the linkage. You can buy new linkage for it.

You will need to find where in the linkage the problem is. I would start taking it apart to see what is and what isn't working correctly. Autozone website has free repair manuals available online.

You may want to remove the cover over the wiper nut and tighten it down. Make sure you don't exceed the torque settings. The nuts have a tendency to back off causing the wipers (or one wiper) to slip.

You know it sounds like a break in the linkage as the wiper motor will not usually let you freely move the wiper arms yourself. Generally there is an arm attached to the motor which in going around and around makes a side to side action in the wiper linkage. Without any more info I would suspect a failure in the ball joint connection between the wiper motor arm and the linkage. On a car that old most likely you should look around for a replacement used linkage on eBay or Craigslist. Once obtained, get yourself a repair manual or search on youtube for a video on how to remove and replace the linkage. there are many folks selling repair manuals on CD for about 10 bucks on eBay.

if u hear motor not elect problem -most likely linkage unbolted from motor with motor running try to move the wiper arms if move freely than need to remove cowl and check the linkage hook up to motor -if wipers dont move freely than possible motor damage/seized linkage damaged but still would have to look under cowl at connection at linkage

it seems the motor is working ok so it only leaves your linkage or the actual wiperarm mounting to fault.remove the retaining nut on the drivers side wiper arm usually a 12 or 13 mm spanner.once removed turn wipers on and keep hands clear, look at the drivers side spindle,if it turns when the other wiper moves your linkage is ok and you need a new arm, if it dosn't move then its your linkage,hope this helps!

your passenger side linkage arm has fallen off of the wiper motor, easy fix, and if you cant do it your self any garage can, cheap repair