a mysterious leak. during the winter, while my boat is on the hard, the bilge fills up, eventually kiling my battery via my hard-wired bilge pump. my v berth and my cabin sole carpet remain dry, but my boatyard needs to keep an eye on the boat all winter. my best guess is that the water is coming thru my hollow mast, but all expl;anations and solutions are welcome. i am tired of dead batteries in the spring. thanks.