SL55/63/65/R230 AMG: Trickle charging through 12V socket (cigarette lighter)?
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Newbie
Joined: Jun 2012
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2003 SL55 AMG
Trickle charging through 12V socket (cigarette lighter)?
Hi folks, question about keeping my SL55 batteries happy and charged. Any issues with using a trickle charger that plugs into the 12V socket (cigarette lighter socket) in the SL?
I've experienced a couple of times that the accessories battery is dead/low after not running the car for a week or so. Of course, the primary battery still starts the car and the secondary charges after a few minutes allowing the roof and other electronics to work.
I just wanted to check what folks are doing to keep their batteries ready to go.
I've experienced a couple of times that the accessories battery is dead/low after not running the car for a week or so. Of course, the primary battery still starts the car and the secondary charges after a few minutes allowing the roof and other electronics to work.
I just wanted to check what folks are doing to keep their batteries ready to go.
Super Member
Joined: Jul 2009
Posts: 603
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From: Asheville, Atlanta
SL 65 AMG, Porsche 911 (993), 2014 Cayenne GTS, 2013 Toyota Highlander Limited
I don't believe it works in a Mercedes SL due to the electrical system design....search posts on this....I tried it with mine and it did not work as lighter is not a "hot" circuit......
Works in my Porsche lighter that has "hot" circuit.......i.e. charges my iphone when car is iff from the lighter, etc....
Works in my Porsche lighter that has "hot" circuit.......i.e. charges my iphone when car is iff from the lighter, etc....
MBWorld Fanatic!
Joined: Feb 2009
Posts: 6,897
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From: Central WI (BFE)
SL55, ML500 & Acura TL
I don't believe it works in a Mercedes SL due to the electrical system design....search posts on this....I tried it with mine and it did not work as lighter is not a "hot" circuit......
Works in my Porsche lighter that has "hot" circuit.......i.e. charges my iphone when car is iff from the lighter, etc....
Works in my Porsche lighter that has "hot" circuit.......i.e. charges my iphone when car is iff from the lighter, etc....
Member
Joined: Jan 2007
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The trunk based trickle charge with the permanent mount is by far the best way to manage the SL's need for juice. My car has been MUCH happier on a steady 12v diet. Plus, it is simple as opening the trunk, unplugging, and off you go...Plus it will force you to replace those trunk struts youve been meaning to get to...one knot on the head is motivation aplenty.
MBWorld Fanatic!
Joined: Jul 2003
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From: Tampa, Florida
06 SL65 / 97 993tt /11 Suburban/ 2012 GTR (AMG è la mia Famiglia la Bestia è la mia protezione)
The trunk based trickle charge with the permanent mount is by far the best way to manage the SL's need for juice. My car has been MUCH happier on a steady 12v diet. Plus, it is simple as opening the trunk, unplugging, and off you go...Plus it will force you to replace those trunk struts youve been meaning to get to...one knot on the head is motivation aplenty.
MBWorld Fanatic!
Joined: Feb 2009
Posts: 6,897
Likes: 85
From: Central WI (BFE)
SL55, ML500 & Acura TL
The trunk based trickle charge with the permanent mount is by far the best way to manage the SL's need for juice. My car has been MUCH happier on a steady 12v diet. Plus, it is simple as opening the trunk, unplugging, and off you go...Plus it will force you to replace those trunk struts youve been meaning to get to...one knot on the head is motivation aplenty.
Super Member
Joined: Jul 2009
Posts: 603
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From: Asheville, Atlanta
SL 65 AMG, Porsche 911 (993), 2014 Cayenne GTS, 2013 Toyota Highlander Limited
You can go to Autozone if you have a cigarette lighter charger and they have an adapter with clips that then clip onto the battery posts.......saves you buying a ctek or similar trickle charger unit for one of the batteries, as you also need to charge the starter battery in the engine bay from time to time - it discharges slower, but I had to replace sooner than the trunk battery at year 6.....
