I had a ground loop problem and alternator whine I fitted a ground loop isolator, which apart from making the music sound weak did cure the ground loop problem but i still had my whine. After lots of messing about with volt meters etc and a trip to my local audio shop I cured the problem (or rather they did). The guy took one look and said i bet its your amp so he got one of the shelve and tried it and low and behold all my noise has gone.
