So I bought this new stereo for my 02 eclipse. What exactly is the process for installing it? I went and got the harness to go from the factory wires to the harness provided by the new radio. But, there are two sets of wire harnesses going into the factory radio. I can only hook up one. Plus, there is that bigger cable that I think is called a DIN. What is that for?

 

Youll need the wiring colors etc. Which are easy to find... you can search for them on here.
But if you have the infinity system, you have an external amp youll need to bypass.