I have a 1988 nissan 300zx and I'm trying to install an aftermarket radio.

Here's a chart that has the insulation colors. You can check the wires coming out of your stock radio and see which ones go to the speakers. http://www.the12volt.com/installbay/stereodetail/1602.html

You will have to run new ground wires to either the front or rear your choice. These Zs use a common ground on the stock radios.

After now three days, I found out that my car has an amp underneath the passenger seat. I called up bestbuy and they said they would install it for me for $40 as apposed to what someone else was going to charge $300. I'm sure it's easy to do myself now that I know about the amp. But I'm just so damn frustrated with the stereo, I'd rather pay someone else to do it. Thanks though.