I have one of those in my SL320, If it resembles a cigar lighter socket it is for trickle charger. If you have a garage queen and it sits for weeks, you plug the charger in there. (It is an option) When you go to start your car it is not dead. It can also be used as an accessory plug, I use mine to power a portable cooler when I go on long trips and pack a lunch. Does that sound like it? if not let me know, there is a fuse panel back there too. Good luck!
Brian
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Brian W. Heitman
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