I have an aftermarket head unit in my TB. My wife is driving it right now and asked to see if I can fix the whine she hears when listening to AM radio. I have seen some of the posts about bose amps and bad grounds... but in those cases did they hear the whine on AM only or across the board. I have to pull the HU out to check that antenna is snug, what else? I never noticed as I only listen to am if riding with my dad.