It sounds as if you are trying to hardwire the aftermarket stereo into the factory wiring which is a bad idea if you are going to cut the plug off the factory harness. An aftermarket harness does not cost that much money, especially in comparison to your car. If you insist on damaging the factory wiring, and all but ensuring you'll have to leave that radio in the car when you try to sell it, nobody will stop you. The nearly universal color codes for aftermarket radio wires is as follows. Front left +/- White, White/Black. Front Right +/- Grey, Grey/Black, Rear left +/- Green, Green/Black, Rear Right +/- Purple, Purple/Black. Yellow is your 12 volt constant (battery), Red is ignition, blue is power antenna (if your car has a power antenna), blue with white strip is amp turn on (if you are going to use an external amp). I wouldn't suggest using illumination and dimmer wires (orange/white and orange) because they have been known to cause damage to people's instrument clusters and other interior lighting, but proceed at your own risk there. Again, it would really be better to just spend a few dollars and get an aftermarket harness--this is what they're designed for, so that you don't cut up your cars factory harness (which are very expensive if they ever need to be replaced, and I imagine you'd want to put the factory radio back in once you get rid of the car, because nobody will pay extra for your aftermarket radio, and most people buying a used car want everything factory so it feels like a new car to them, instead of a reminder that someone else had the car before. Just think about it, but aside from that, I hope the information will be useful to you.
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