Is it possible that the switch on your dash for the bilge is set to ON and the only reason you hear the pump run is when you cut the Battery switch ON? This would mean the float is bad. Good time to check your wiring down in the bilge too. Seen too many of my buddies' boats have deterioted wiring so bad it's a wonder it works. I have found that after the copper wire degrades to a green goo, it will still conduct for little while, then POOF!
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