Did you use the little jumper plug in the upper right corner of the back of the newer Premium Sound CD player? It plugs in where the CD player harness would plug in to the old JBL radio.
If you tell me what vehicle the radio came out of and what it is going into I can look the harness up for you.
I got the stereo from a 1996 Thunderbird, it is dated 1995.
It's going into a 1993 Thunderbird w/Jbl sound.
Is the newer radio a JBL stereo as well?