As said, the switch provides both power and ground to the motor. There is no motor case ground.
Power window problems are very commonly in the switch, usually the drivers door switch as it gets the most use and is the more complex one.
A wiring diagram would be very helpful but hard to find. have you searched any Corvette forums? Maybe find a diagram or could be a common problem with that model.
I would start looking at the drivers side switch. There has to be a positive and ground wire to the switch. Determining which wire is the hard part.
Once you determine the main power wires, check for 12v ACROSS those 2 wires while trying to operate a window (performing a load test). If you don't have power there, there is a bad connection to the switch. If good power, chances are it's the switch.
Sometimes you can ease them apart and clean the contacts.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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