I tried to install a Kenwood dnx-5120 last night and it doesnt work. I have the correct wire harness for my jbl crap and i hooked everything up right. When i try to turn it on, there is nothing. The head unit will not turn on. I'm wondering if maybe i got a faulty harness, or a faulty head unit. Does anyone know something i might be forgetting? I checked all my fuses and they are good. Any help would be much appreciated. Thank You.