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post #1 of 14 (permalink) Old 06-26-2007, 06:34 PM Thread Starter
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Question Battery charging

Sorry for the double post. I put this in technical, Audio/Telemetrics and maybe that wasn't the right place?


My wife's CLS 500 doesn't get driven much... 10,000 miles in two and 1/2 years. Several times, we have had the battery go dead and Benz sent someone to jump it for her. The dealer suggested that we get a trickle charger for it.
Recently, I acquired a new Cayman S and purchased a Techequipment trickle charger when I bought the new car. I decided to try it on the Benz, but it doesn't seem to work, at least it doesn't appear to when plugged in. I followed the instructions and set the mode to "car" (14.4 amp battery or larger). I plugged in the car side into the cigarette lighter as instructed (before plugging into the outlet), not one of the other power outlets. The charger lights up, but the indicators for partial/full charge nor the fault light come on. I was wonder that because the car has two batteries, it won't work unless the charger is connected directly to the main battery? Anyone with a thought?
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post #2 of 14 (permalink) Old 06-26-2007, 08:09 PM
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Without the key, the circuit between the battery and the cigarette lighter may not be complete. Does the lighter work without the key?
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post #3 of 14 (permalink) Old 06-26-2007, 08:24 PM
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Yeah. Sounds like Porsche (is that what Cayman is?) might have cigarette lighter plug "hot" all the time, when in MB cars it works only with the ignition on. Some models like ML have auxiliary outlet, that is "hot" as well.
Is it a trickle charger, or floating charger? Trickle charger might destroy the battery when left on for long time. The proper would be float charger, or battery maintainer.
With alligator clips for the batter hook up on Mercedes.
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post #4 of 14 (permalink) Old 06-26-2007, 09:54 PM Thread Starter
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battery charger

Quote:
Originally Posted by Kajtek1
Yeah. Sounds like Porsche (is that what Cayman is?) might have cigarette lighter plug "hot" all the time, when in MB cars it works only with the ignition on. Some models like ML have auxiliary outlet, that is "hot" as well.
Is it a trickle charger, or floating charger? Trickle charger might destroy the battery when left on for long time. The proper would be float charger, or battery maintainer.
With alligator clips for the batter hook up on Mercedes.
The charger is probably a "floating" type if that means it powers down once the battery is charged. The instruction say it can be left attached for months without harming the battery. As for the lighter socket, that maybe the issue since the Porsche socket stays hot with engine off (radar dector stays on). I'll have to check the CLS as I'm not sure...do that in the morning. The Cayman has two other power points, but instruction say use the lighter socket. The CLS has at least one other in the back seat, so I'll check that too.
Thanks for the thoughts. You may have hit the problem.

Last edited by Seamus42; 06-27-2007 at 06:11 AM.
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post #5 of 14 (permalink) Old 06-27-2007, 02:33 AM
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what i can recommend is once a day or on days you dont drive the car, go outside and start the car and let it run for 5 to 10 minutes. this will keep the battery charged. (assuming its good). i recommend this to customers all the time.
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post #6 of 14 (permalink) Old 06-27-2007, 04:36 AM
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I use the trickle charger from Mercedes. I leave my SL sitting for up to 4 months at a time and when I come back to it the car starts perfectly.
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post #7 of 14 (permalink) Old 06-27-2007, 06:09 AM Thread Starter
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Battery charger

Quote:
Originally Posted by Corkscrew
I use the trickle charger from Mercedes. I leave my SL sitting for up to 4 months at a time and when I come back to it the car starts perfectly.
This is exactly the same charger I have, except for the MB versus Porsche lettering. So, do you just use the lighter socket? Is it powered when the key is off? Or do you use an Aux. socket?
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post #8 of 14 (permalink) Old 06-27-2007, 08:00 AM
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Quote:
Originally Posted by Seamus42
This is exactly the same charger I have, except for the MB versus Porsche lettering. So, do you just use the lighter socket? Is it powered when the key is off? Or do you use an Aux. socket?
I use it directly on the battery terminals in the trunk.

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post #9 of 14 (permalink) Old 06-27-2007, 08:43 AM Thread Starter
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Question Battery charger

Quote:
Originally Posted by Corkscrew
I use it directly on the battery terminals in the trunk.
But my charger doesn't have alligator clips, just a socket plug in. I checked all of the sockets and none of the three (lighter, back seat or trunk) are "hot". Wonder if there is a way to make one of the "hot" when the ignition is off? Could the dealer service do it?
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post #10 of 14 (permalink) Old 06-27-2007, 09:05 AM
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Quote:
Originally Posted by Seamus42
But my charger doesn't have alligator clips, just a socket plug in. I checked all of the sockets and none of the three (lighter, back seat or trunk) are "hot". Wonder if there is a way to make one of the "hot" when the ignition is off? Could the dealer service do it?
Hi, Seamus.

If you want to use it on both cars, I'd hit the auto parts store and buy a cigarette lighter extension (the kind that has both a male and female end).

Then cut the male end off and put some alligator clips on it -- mind the polarity -- connect it to the MBZ battery (or booster connect point if you have one) and then you can plug the Cayman's charger into it.

I seriously doubt you'd find a reputable mechanic who would bring one of those hot for you.

Take care and enjoy the ride,
Greg

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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