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Trunk convience port normally unpowered.

698 views 5 replies 3 participants last post by  tonyjroy 
#1 ·
09 SL 550: How do I make the plugin port, in the trunk, powered for charging the trunk battery. Currently it's only "hot" with the ignition on.
 
#6 ·
That is interesting since the Mercedes brand the CTEK are supposed to be the same with different branding. You might be able to fabricate your own plug system and wire it directly to the battery. I personally would pursue that option versus rewiring anything (even something that seem innocent like a 12V charger outlet) on this car. Too many things are interconnected. Or you could go the easy route and for just under $70 get the CTEK with the cable included.
https://smile.amazon.com/gp/product/B006G14FK8/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

Good Luck
 
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