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I just watched some driver training videos for the M939 series trucks (and no, I will never admit to doing that at work...;-)). On start up, instruction was specifically to turn Battery switch on, then the Ignition switch. Shut down instruction was Ignition off, then Battery off. Yes, I...

A manual (-10 maybe?) actually does say something about Master switch on-Ignition on, Ignition off-Master switch off, I remember reading it and having a warning about damaging the charging system. It was many moons ago, so I don't recall exactly where I read it, but I always do my 813 that way...