Well have a near perfect stereo system, came to an end this weekend. First trip in the water and everything was great. Second crank on the engine and she fired right up. Now for the stereo system. While we were getting the boat ready on the ramp, I wanted to test the system. Sounded awesome. exactly how i remembered it from last year. Now the problem. I went to start the boat, and a high pitch noise came from the speakers. I haven't even started the engine yet. I just turned the key to "ON" and heard this high pitch noise. Now with the engine running, I do not get alternator noise. It is a constant High Pitch sound. I can not figure it out. What do I need to check. I tor everything apart and checked my wiring. Everything looks good and solid. Not sure what I did over the winter months besides not touch anything. Can anyone suggest anything. I am willing to try it all.