did you even check the fuse for the radio? and it would be one thing if it was your radio but your Cig lighter isn't working also. Then it wil be a fuse. And I know that if it isn't in the cars fuse boxes it is in the engine compartment and it is going to be that 7.5 back up fuse. Unless, your cig lighter never worked in the first place. When you find the problem say Hi to the gremlins