I am back again with a ? about my Grand Am , When I hit the brakes I am noticing that my headlights dim a bit when I hit the brakes, also the radio will cut out every once in a while when this happens, I want to put in a new radio, but don't want to fry it if there is an electrical problem. I don't know anything about the electrical system on cars. What could my problem be? alternator?

Thel