My 2000 Sportsman, freightliner chassis, 275 cummins. The chassis batteries do not stay up even though they are only a month old. Now I keep the + cables d/C to keep them from drawing down. The batteries are Elite deep cycle. The Intellilet is model BD2 and I keep it in store mode for the chassis batteries. When I connect cables I do not see a spark but have not tested with volt meter to determine if there is s draw. Thought perhaps there is a way to ck. the Intellit. Why would batteries loose power when it is turned off. Engine will not start if it is turned off or in store mode. Thanks for your help.