b1g1an
MB Enthusiast
Yes, it does but it doesn't provide emergency opening of doors. If the main battery dies, so does the system completely. Only if the voltage drops low during IGN on and engine running does the AUX come into play.
This thread reminded me I kept meaning to ask you, I'm sure you've said previously, when you had your 55, that MB recommended you connect at least one of the fly leads for trickle charging somewhere else in the boot rather than directly to the battery where mine still are?