I have hooked the ignition cable to the jack comming off the ignition wire at the fuse box. I wondered if I have to run the battery cable to the battery or if it can be run to the fuse box where the power fuse is? Should the radio work in the acc position? I had the radio working except in the acc position so I kept going to different places and now I think I have burn something up. I only get a blank screen and no sound when I turn it on. I just need to know that it is wired right and then figure out if I have done a number on the radio. I am trying to put a AM/FM in a 72 SS. Thanks for any help .