Power Windows, help!

[Mike 88GT]

Power,
I haven't done any stero install in it yet that I would gotten close to any factory wires like that. I too know about stero installing and know that thats not the problem. It was doing it when I first got the car. Ex. If I'm roling up one window and someone eles roles theres up at the same time, the will both cut out and then theres no power to any of the 4 windows. Someone once told me that my power window circuit board was getting bad and cutting out on over load. Then it will reset it self and work again. Do you know where this circuit board is? And could this be the problem? If its wiring, where would I start to look beings all the windows are affected? I know how to use my amp. meter and volt tester, but just don't have a clue where to start. I have tested at one window at a time. And when it will cut out, the power just disappears to it. Is there somewhere I could order a wiring diagram for my car? Thanks for your help and responce.