I will tell you what I did. Bought a new deck and ran all new wire, but what you can do is 2 of the four wires run the tweeter.If you can get a hold of wiring diagrams they will let you know which. These you can tape with electrical tape and use the other two. Those are from the premium sound that some have. There were actually three levels of stereo speaker setups for the car. Sorry I do not remember which wires are for which. I may be able to look it up on the computer program at work. If anyone has access to alldata, theyy could let youu know.