engine noise through speakers help
i have a 93 325is Like the title sais im getting an engine whine through the speakers. it does have an aftermarket cd player. I baught the car this way. i was told could be a ground wire on the factory amp so i ran it to a better spot and nothing.. so any help with why it would do that would be appreciated.
it did have a pioneer headunit when i baught it. it made the same noise. i put a BOSS flip screen in it it still makes the noise.