95 ford explorer speaker wire

I have a 1995 Ford Explorer 2 door 5 speed with the stock tape player. I have installed a Sony Xplod cd player and have got it all wired up and it turns on and works, but I cant get the speakers to work. If I connect two of the same colored wires from the stereo to a extra speaker, it works but none of the wires from the cars harness will allow the speakers to work. Could someone help me out with a color diagram? Off the top of my head the wires from the cd player are Gray Gray/Black Purple PURPLE / black White WHITE/ black Blue Blue/Black