I own a 1978 bronco and i had a 1979, and my father owns a 1978 Bronco. Problem On all 3 the rear windows work like crap.Real slow and when it gets cold not enough power to close on their own. I have to use the key and pull on it to get it closed? Ive cleaned and lubed the gears and track.My dad thinks maybe poor ground????Any Help???????