Audio Systems: substituting am/fm tape player on 92 dodge stealth to am/fm tape/cd player form 91 3000gt, car radio wiring, dodge stealth

Question
I recently purchased a 91 3000gt am/fm tape/cd combo to replace my defective am/fm tape on my 92 dodge stealth (has static problems,tape player ok). Installation was easy except of course, I do need some type of harness adapter. My 92 stealth only has a two plug harness and when I plugged it in the 91 3000gt unit, I got power, but no sound. There is a black square plug along with a round black plug on the 3000 gt unit near the identical looking plugs from my stealth unit that I feel sure play a part in this problem. To sum up, 2 plugs on stealth radio plus antenna connection. 4 plugs on 3000gt unit 2 same as stealth unit, 1 more square plug and black round plug I guess for cd and equalizer and then antenna connect.?Can you help me? thanks

Answer
Try this:

http://www.installdr.com/Harnesses/DCP-Wiring.pdf

and this:

http://www.modifiedlife.com/1992-dodge-stealth-car-radio-wiring-diagram/

The wiring diagrams above should help you sort out which wires are going where.

And, you can purchase wiring harnesses at www.installer.com.

http://www.installer.com/cars/by_car.php?carid=1886

You may have to hunt around for your exact model and year for the right harness/cable pieces.

Best wishes.