When you unbolted the power window motor unit from the door, you probably allowed enough slack in the cable to have it slip off of one (or more) of the six guide rollers, or let the two cables tangle up with each other on the motor spool. Either way, you probably don't need to buy a new window motor, or cable, you just need to correct the routing of the cable, both around the six rollers in the door and the window motor spool.
Both ends of the cable terminate at the outer flanges of the motor spool, and are wound towards the middle where they just about overlap. As the motor turns, one cable unwinds from the spool whilst the other cable winds up onto the spool, taking the place of the unwound wraps. The motor spool has grooves that the cables ride in, that almost look like threads on a bolt. The system should always have enough tension to keep the cables from coming off the rollers and from unravelling and getting bound up with each other at the spool. When a new cable motor comes from a vendor, the cables are pre-wrapped on the spool, with both ends starting from the spool's outer flanges and meeting near the center where they are secured to each other with a strap or cord. This strap keeps the cables tightly and neatly wound on the spool so they don't get tangled during transit or installation. Once the motor is bolted to the door skin, and the remaining cable lengths are wrapped over the six rollers, the strap or cord securing them to the spool is cut and removed.
I had the cable in my driver's side door come loose when I replaced the window, and it really got horsed up at the spool. With the help of a friend (who applied constant tension on the cable) I was able to carefully operate the motor back and forth to free up the tangles at the spool and get the two cable ends to lay down properly again in the spool grooves in situ, but it took about an hour. Another option is to remove the motor and cable assembly completely from the door, re-wrap the cables on the motor spool correctly, secure them where they meet in the center of the spool with a wire tie or cord, reinstall the motor, route the remaining loop of cable properly around the rollers, then cut the wire tie that is holding the two cables tightly on the spool.
Keep in mind that one of the upper rollers (the second one from the back of the door) is bolted in a slot in the sheet metal, and this roller is designed to be moved forward or back in it's slot to allow for a slight adjustment in the system's cable tension.
'88 Quad - "Claudia"
Last edited by Norseman50; 05-16-2019 at 07:22 PM.