I replaced both of my batteries in my 03 Silverado 2500hd 6.6l, I got back into the truck it started fine. I noticed my aftermarket pioneer radio was not lighting up at all I tried turning it on and nothing. I also noticed I have no door chimes at all. iv pulled the radio out to look at the fuse behind it, it is good. I also checked the fuse for radio and radio amp in the hood. I even used a multi-meter to see if the radios wiring harness was getting power and it is. I don't think it is a wiring problem just because nothing was touched. once again I changed both batteries and now the radio wont turn on.