Air Con & Amp Hum

[LMBoat]

Hi All,

I have 3 AC's on board. When the master AC kicks on I get a ground hum in the 12v salon stereo amp. When either of the other 2 AC's kick on, this does not happen. I've check at the grounds and all are good. Any idea on how to fix?

Thanks for the help.

 

[Wylie_Tunes]

What is good about the ground? Specifically, what did you eliminate during the check? Is there a voltage drop, proper gauge. Cables terminated to the most ideal spot. All the same hold true for the amp's B+, dont overlook it. Is the hum entering pre-amp or post amp? The cause can just as easily be the AC unit.

 

[bobeast]

Sometimes it can be a matter of wire routing. For example an AC line running parallel to a dc feed can induce hum in audio equipment.