Ryan, first let me say I wish you all the luck possible in getting your cd player working. I pulled up crutchfields' site, put in 88 mustang convertible with 6 speakers and got this link, hope it helps you. It shows 3 plug ins for premium sound.
http://www.crutchfield.com/S-2GQ4HqJH8Sg/App/Product/Item/Main.aspx?I=120705006
Click on the Read More part of the item description. It goes into detail. Here is what it says:
Crutchfield custom wiring harnesses are lifesavers! You'll save many steps when installing an aftermarket receiver in your car. Simply splice the color-coded wires on your Crutchfield harness to the wires from your aftermarket radio — and do it in the comfort of your home without having to struggle with splicing wires behind your dash. (Most of the wire splices can be made on your work bench or kitchen table. Soldering is best, crimping is also very popular — see "Accessories").
Next, plug the Crutchfield harness into the harness that you removed from your factory radio.
Read More
Since you didn't have to cut off your car's original radio connector, it's easier to put the factory radio back in when you sell your vehicle or return it at the end of the lease. Just plug the factory radio back in and keep the aftermarket radio! Best of all, the harness is free with most of the receivers Crutchfield offers! 30-day warranty.
Connections:
Note: Two speaker harnesses are included — one is used if you have a factory amplifier, one is used if you don't. If there is no ground wire in the factory harness, you'll need to make a ground connection between your new receiver and your car's metal chassis.
12V constant power
12V switched power
chassis ground
power antenna turn-on
dimmer
left front speaker +/-
right front speaker +/-
left rear speaker +/-
right rear speaker +/-
i didnt get that small connecter there! it says preinum sound on the bag to!!
my mustang only has 4 factory speakers? two in the dash in 2 in the rear it dont have them in the door!


