1997 GMC Sonoma ABS PROBLEM

I am also having the same problem. When I hit the window buttons it does not go up and down and the ABS light comes on until I let go of the button. The ABS light also comes on when I turn on the AC, and the AC does not work.

Have you figured anything out that fixed your problem? I have replaced the battery and the connections because it was bad. I have also had the alternator check and it is working properly.