2001 dodge caravan sport

The radio only plays on AM, used to at hit and miss play FM. Is it a fuse or switch gone bad, or the whole thing messed up?

The problem is inside the radio I'm sure that's what you meant though when you said fuse or switch. You could I guess take the thing apart and may be able to fix it, It's probably the switch right there where you switch it from AM to FM. Connection probably gone bad, you may be able to take the switch out and clean with a toothbrush or something. I would just get a new one though.