This is for 171 ( Facelift ) Owners more so.
Hard Wired Direct to Car Battery using CTEK Cabling so no longer Req bonnet up connection purposes and ideal for Easy connection Access for winter Hibernation and those that indoor Cover there SLK’s .
Plus no signs of instillation signs under the Bonnet . 😎😎
Note : This install met my requirements but may not suit all.