Pioneer alternator whine - NOT blown pico-fuse! - Realm of Excursion

it COULD be, as unlikely as this is, your amp for your speakers. friend has the same issue with a pioneer deck. we know its his amp, sadly. just picks up very minor noise. other than that, the hu ground would be my guess. otherwise, ... and tieit in with the regular ground, path of least resistance will win, dont care which it is. One more question - When was your last ignition tune-up? In my car that ended up being the culprit, wires and a cap got my whine gone. ...