hi there. First off I'm not the most knowledgable when it comes to cars. Anyways, I bought a 2002 suburban with a stock radio. It has instant but that is separate from the radio placement. I bought the correct adapter kit for the wiring and for the antenna. I plug everything in and the new radio powers on, runs a cd, everything but NO sound. I'm not sure what I need to do. I have read I may need to bypass the stock amp, but I don't know how to do that. Any help would be great. Thanks.