We've had a problem with the battery going dead on our MB. I parked our 560 SEC for a week and went out to start it, the battery was low and all I got was the click, click of the solenoid. I went back a day or two later to jump start it and got nothing. Charged the battery and tried again, nothing. We replaced the neutral safety switch a year ago so I'm thinking that isn't it. Is it possible the alarm system could disable the starting circuit? Other ideas?