Ok. I have a 2003 tundra. So I've been looking around on different sites and have learned that putting an aftermarket head unit into a tundra with a factory amp (like the one I have) is a problem. Before I knew this, I bought a stereo harness from walmart. It doesnt fit the 20 pin harness in the truck but I found that there are two harnesses that go into the bottom of the factory amp. These fit the harnesses that I bought. I hooked everything up but nothing happened. Is this supposed to work? Is there any way to put an aftermarket stereo in my truck?