confirm that the wires are matched up properly, The harness you got, that plugs into the ford wiring harness, should all be labeled. Take those labelled wires and attach to the labeled wires from the cd player. Red is usually constant 12 volt, yellow is the ignition source and black the ground. If you have those three hooked up right then you should be able to turn the key on and it will come on. Assuming you didnt blow any fuses while you were "trying to figure it out." Ive dont it before and is always handy to have extra fuses. The mustangs are really easy to install a h/u. Look in your owners manual for the fuse box diagrams. Page 181 if im not mistaken. All the fuses that are associated with the radio should be checked.
My tbird has a factory system w equalizer and amps. It uses a common ground source. Im pretty audio savvy and it took me several hours to install an aftermarket h/u in it, for the simple fact that i didnt know about the cgs. I was pissed and relieved when i finally got it tho
hope this helps
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