[Bassman]

I have a 2006 3200 Open with Cummins, yesterday I was underway and started to hear a high pitched electronic sound. I tied up killed the engines, still heard it. Turned off the electronics, still heard it. Checked all of the breakers/fuses still heard it. The only thing that worked was to shut off the batteries. I did this several times and every time I turned the batteries on the sound would come back, not an alarm just a tone. After several minutes I started the boat again and it went away. Everything seems fine with the systems on all fronts and the boat ran fine.

Any thoughts on what this may be, it sounds like it is coming from behind the dashboard.