I have a 2002 Centurion Avalanche with the Mercruiser 315, I have a whining noise in my stereo when the boats running. <BR> <BR>When I got the boat a year ago everything was fine, except the wiring for the amp's looked like a 12y/o did it. So me in my ultimate wisdom decided I needed to clean it up. In the process I disconnected all power from the batteries, I neglected to move the batteries from there boxes and somehow or another the ground cable came in contact with the positive of the battery. Ever since this happened I have been chasing this problem. <BR> <BR>I have <BR>Checked all the grounds <BR>Replaced the deck <BR>Replace the batteries <BR>Replaced the alternator <BR>Put a noise isolator in for the deck on the + <BR>Replaced the cap rotor and plugs <BR>Replaced the amps <BR> <BR>Anyone have any advice for me, I'm at a loss and am down to replacing the ECM