From the only other guy on this thread with this coach, Scott has it exactly correct. This is a Freightliner problem that Winnie simply fixed. The engine and Allison transmission both have CPU's in them and they will drag the starting batteries down between one and two weeks. My coach has a Trik-L-Start for cross charging but you have to be plugged in for it to work. This is the main reason I installed Solar; because I didn't want to shut the coach batteries off (mine has a switch for that too) because the Allison will lose its driving memory and I'd have to teach it how I drive all over