I have a 92 yj and I just replaced the windshield frame and windshield. When I put the motor back on and hooked everything up the first time I failed to test it before i reattached the roll bars, hard top, etc., and put the wipers on. When I ran the wipers the first time, they went from park to full extension fine, but on the way back, they froze at the top of the path, so the wipers were totally vertical. I took it all apart again, reattached the wiper linkages, and it actually moves now but when it gets to the top of the path on the return, it hesitates badly. Video below. You can see that the motor actually torques in its mount. Does anyone know what's going on here?