96 bayliner Capri 1850 v6

My boat is making a humming noise when everthing is shut off. I've varified that it isn't the bilage pump or the fans because I can turn them on and hear them run. I pulled a 2 amp glass fuse at the battery and it kills whatever is running. Can you tell me what it is that's running and why it stays on even when the key is off? Thanks.

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