87 thunderbird TC w/premium sound
Ok. I have an aftermarket deck installed into my car already that does not work properly.No display. Anyway I picked up a new Sony CDXGT400 reciever and went to install it.Thats when I noticed that the previous owner has cut and hard wired in the old reciever.i also noticed that the rear speakers are run off a Harmon Cardon amp. All the speakers are stock Ford ones. So what the heck do I do here???Do I use the wires that he tapped into or what??? The factory system was a Reciever/EQ/Amplifier.I think I need help.