Originally Posted by
philwsailz
Do you have a dual battery system in your boat?
If I read right, you moved the head unit's yellow power wire to the amp, but left the red power wire in the console wiring? Moving one without the other can cause the problem you describe... It can happen because your head unit is now potentially/possibly getting its power from two different batteries if you have a dual battery setup, and/or the red power wire is still getting a bunch of noise on it from other items connected to the same power at the helm, and it is at a slightly different voltage potential from the yellow power wire. You need the red wire at the same power source as the yellow wire...
Double-check that or clarify for me; you might have just described the primary reason for your alternator whine...
Phil
Kicker