I have a 2005 Yamaha 225 4 stroke and my dual batteries die after non use for a week or more. I turn off both batteries to the off position and they still go dead. The dealer tells me that the bilge pump is hard wired to the batteries and may be draining them. I thought this could be true because the boat is kept on a lift in Florida and in the summer we get a lot a rain but it hasn't rained that much and they still went dead!
