I have the 2500 model same year truck. In my case it's a 10 amp fuse. If not the fuse, could be the switch itself, the on/off switch. They do tend to wear out. I added a radio/cd player in the center of the dash, and they do make a color co-ordinated pannel for our year truck. After they did this, my radio and clock didn't work either, but I didn't care, with the new one.
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The radio and clock get power from the battery for memory thru a different fuse than the radio fuse. Sometimes this is thru the cig lighter circuit. You might want to look at all of the fuses. Could be a problem inside the radio too.
Hey, Buddy.. I just had the same thing happen to me. If you look under the hood over the left front tire you will have a black box with Electrical Center written on the top of it. Just look in there you will have a fuse marked Radio that will be blown. It should be a 15 amp fuse.
I am surprised that GM has all that stuff on one fuse and of all things on the Radio fuse...
I am having the same problem on an 04 2500hd there isa 15 amp stop light fuse inside the cab on the side of the instrument panel and a 25 amp stop light fuse under hood. you could also have a break switch issue the switch is located up on the break pedal linkage you should have power on the white wire when you push the pedal in (check with a test light) in my case I have a broken wire along the frame rail in the harness it is a light blue wire,