I have replaced my electric motors on both of my windows, and they still seem to work slow. Sometimes they go up and down relatively fast, but other times, you would think the battery is about dead, which it is not. Does anybody have any suggestions other that replacing the regulators. Thanks

Jimmie

mine does the same. they slow down when they get close to full up position. dosen't get any better with the door open so i know its not hitting the weatherstripping. it seems that the the motors are just getting tired. it gets worse with the engine off a little better when i rev up the engine. gonna take the door panels off soon and get a better look inside.

Sounds like a symptom of tired wiring. The motor slows down when the work load increases, which in your case is when the window approaches the fully up position (it gets hard to crank the manual kind when you get close to the top too). At that point the motor is drawing its peak amperage and, due to corrosion on contacts and within the stranded wire itself, it's unable to draw the current it needs to maintain its rpm and thus it slows down. The other unfortunate byproduct of this problem is heat so always be wary of the smell of hot electrical or anything burning. Short of replacing the wiring harness, all you can do is clean all the contacts in the system from the battery to the switches and finally the motor. That and keep the window mechanisms lubed and working freely.

I've been chasing this same problem with the power convertible top on a '63 T-Bird for years and have even had some small electrical fires. Bottom line, wiring has a definite life span. I've cut the wiring open in the middle of a long run and found corrosion in between the individual strands of the wire inside the interior.

By the way, the contacts in GM female plugs can be cleaned by removing them from the plastic plug body. If you need to know how just let me know. I've also found that a small wire wheel in a dremel tool works great for cleaning wiring. You might also consider some dielectric grease to keep the contacts from corroding after cleaning.

PS - If you think parts and restoration costs for C3's are bad you should try a T-Bird once!!

(and yes, I know it's a Ford)