enviorment and lack of use seem to find a way to slowly kill a boat! i would start with fuse panel check and clean all contacts check any spliced wires that someone did and be careful not to disturb any other wires. corrosion will build up at connections and soon enough will be your next problem. but for the fast and best cure is to bring two wires up from battery like destroyer said and connect your electronics. be sure to use one fuse for each piece of equipment. check to see if you have a battery shut down switch to cut all power from the battery when not in use but be careful here you need a fused direct connection to a bilge pump when in the water. if your system is checked for no current drain on battery you really dont need a battery switch butttttttt sometimes you may leave something on or a stuck pump or other drain on the battery. you can check your battery for a drain by using a test light. but you have to PUT THE TEST LIGHT BETWEEN THE NEGATIVE POST AND TOUCH NEGATIVE CABLE that you took off battery . be sure positive cable is still connected. test will light if you have a draw in the system note you are not connecting a test light in a normal way like you do when testing for positive current.
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