need help replacing radio in 91 bravada

I bought a poor abused 91 bravada that has 230K miles on it and am surprised that I absolutely love it! I was the best $200 dollars I have spent. One of the problems is that the previous owner put in an after market stereo in it and of course took it out before selling the vehicle so I am left with a bunch of wires in a hole. The good news is that my friend gave me a stereo and a couple of speakers, should I happen to need them, but I have absolutely no clue on how to install it. Does anyone have a wiring diagram or something that would help with this problem?

Hi, from this site, download the PDF file for your Bravada. It has complete and detailed instructions.

JimC