Mine , sitting in a closed concreted garage had a pair of rats that did a number on my boat. Couldnt get front graphs to turn on, so opened back compartment and could see rat droppings. They chewed on bilge lines and on lines leading from 24 volt battery. Oddly i had trolling motor power. Turned out my 12 volt battery was bad. Replaced it and have power everywhere now but sent ut to marina to fix lines and chewed wires and service. I caught the suckers but figure it will cost me a a grand or so.