2013 hyundai sonata GLS. So basically as the title says. On my way to work i noticed that while my headlights are on my radio screen dims but brightens up like normal when they are off. I check the lights on my dash as well but as far as i can tell they arent dimming. Neither are my headlights( although they do need a bit of a clean). I tried using the dimmer switch but it didnt brighten. Im 99% certain that it might be a fuse but as im currently at work i cant check. Someone said it could be my alternator/belt but i had those checked about a week ago and they are fine. I was told it was normal but ive had this car for a bit and im almost certain that its not done that before. My coworker told me to post here. Any advice would be awesome