Not sure if this is going to fix your problem but I am having an issue with my interior lights dimming. The headlight swithch/dimmer is going bad. I will be replacing it soon. Oh, and my radio is working fine.....I do have a burning mell and i know its comming from the headlight switch! So I would take that small door off thats on the driver side and check it.....You could have some melted wires or chafed wires touching!