Radio hook-up problems on 1990 Chevrolet S10 Blazer

I have a 1989 S-10 Blazer. I'm trying to hook up my radio but I'm not getting anything . There was a radio in there once b-4 working. When I tried to put a CD player in there it's not working. I have 2 CD players i attempted to put in and I get nothing.. What am I doing wrong?

4 answers
i had the same problem check the horn fuse its the constant power wire for the radio dont ask y just a gm thing
Did you figure it out? In situations like this I like to have a wiring diagram to figure out which wire is which.
make sure you have a good ground you may have to run your own wire
Check the fuse. I did this hooking up subs and an amp with my new radio. If the wires make contact with bare metal then it will blow the fuse.This is probably what is wrong.