What type of vechicle is this? If it's an 98-01 accord as your avatar shows, then its a fuse. My brother and I have the same problem with his 98 Accord when we installed a new Kenwood unit into his car last summer. I am assuming you hooked up the dim (orange) wire? That's what was causing the fuse to blow on our setup. FYI, the fuse we had problems with is located on the front passenger side... by the console there (near the door). After replacing the fuse and to resolve the fuse problem, we did not connect the dim wire because it kept blowing the fuse again.