Tell us a bit more about your rig. What year is it? How old are the batteries? Do you have any other wires on the batteries. Also before putting it away did you check to make sure you had water in the batteries. Without a charger hooked up and overcharging, it would be hard to lose the water in the batteries.
Tony & Ruth........... FMCA#F416727
Newmar Dutch Star 4320, Spartan MM Chassis, Cat C9, Jeep Grand Cherokee,with Hemi, hooked up with a Blue Ox Aventa LX, and Brake Buddy.