I have the same problem with my top. It just makes a really fast click in the back when I push the button and the motor doesn't do a thing. Is there a relay at the motor as well? i guess that click would mean the relay is working, but it's worth a shot.
i ended up putting the top manually down... what a pain. And putting it up manually is a huge pain as well. You need to be a muscle-brain to budge that thing.
I just reglued my rear window with rhino glue over the weekend and had the top in various positions to do just that. I wonder if I somehow tweaked the motor.
I have every tool but a freaking multi-meter. I guess I'll try a test light.
1990 7-up 5-Speed - 331 Stroker, Eibach Pro kit, tubalar control arms front and rear, full sub-frame connectors, 185cc heads, TF Street Burner, X Cam, 3.73 gears, pro comp ignition, etc. etc. etc.