94 chevy pickup stereo

I am trying to install a cd player in my 94 chevy pickup. I have always been a ford guy so I'm kinda lost. I can't find the plug in the trucks wiring harness where the head units harness hooks into it. The truck has a factory AM/FM and the cd player moves to the center of the dash. If anyone has any help let me know.

i got it. remind me never to take that head out.