Hey. I just joined the site! I'm hoping someone here can help me. I have a 1993 Olds Cutlass Supreme Convertible 3.4L. I need to know where the engine ground wires are. And the windows work sporadically. Could that be caused by a loose ground wire? The front drivers side window has never worked but the pass side has. The 2 back windows, sometimes yes, sometimes no. I know that I can loosen the panel and move the wires and it will start to work on the drivers side but the pass side just quit working all of a sudden. They all worked from the controls in the drivers door control unit. (except drivers door window) When they don't work, you can't hear any noise like a motor turning or anything like that. My husband bought the car for me in Nov. and has since passed and wasn't able to fix the car. I've had a new radiator put in, bled the coolant system, (I did it myself, yay me!) new motor mount, a wheel hub (that come to find out it didn't need) put in, a belt put on it, a tune up and oil change done on it, a thermostat put in and a new battery. Oh and had all the fuses checked. If someone could help me I sure would appreciate it.

 

I would suggest buying a copy of the 1993 Olds Chassis Service Manual. It will have a detailed wiring schematic in it that will help you chase your grounds for both the engine compartment and interior.
Ebay or Amazon is a good place to start looking