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high pitched sound from compartment at stern in center
I just purchased a sundeck gs211 with 150 Yamaha and i am concerned about a high pitched sound that comes from the compartment at the stern in the center. the area next to the batteries. It occurs every time i turn the master power switch on, with the engine off and the key out and every other switch off, this sound occurs. it is very annoying and will ruin the time when the boat is parked and we want to listen to the stereo. plus i am worried that it indicates a problem. i have heard the bilge pump run and it does not sound like that. Does anyone know what this is or how to stop it?