I have a 2004 blue wave CC I inherited from my father in law. It sat for about a year, now im getting it ready to go. The boat started up before I took the batteries out to charge, but I could tell they barely had a charge. So I took the batteries out to charge and when i put them back in there was no power to the boat. The wires are hooked up right and there is power to the fish finder but no power to the boat. What is causing this problem? Is there a fuse blown?