CL55 Battery Tender - Mercedes-Benz Forum
 
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post #1 of 7 (permalink) Old 03-26-2019, 10:10 AM Thread Starter
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CL55 Battery Tender

Hi everyone,

My 2006 CL55's battery died while I was away, and all power is lost in the car. This is what I've tried so far:
-I thought I could hook up my Battery Tender to my battery, so I unlocked the trunk using the key, but was not able to open it up all the way because of the hydraulic trunk opener struts.
-I pried open the carpet beneath the passenger side footwell and removed that foam thing and the metal foot plate and was able to access a variety of wires. Does anyone know if I can attach my battery tender to any of these connections so that I can get power back to my car? I don't have a jump starter or anything like that, only a battery tender.

I'm a long-time lurker on this forum, but this is my first time posting. I hope I'm not posting in the wrong section.
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post #2 of 7 (permalink) Old 03-26-2019, 10:58 AM Thread Starter
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Sorry, I didn't really ask for anything in my original quote. Does anyone know how I can maybe charge my battery so I can start the car? I would really appreciate it.
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post #3 of 7 (permalink) Old 03-27-2019, 05:23 AM
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Red is the positive...and any metal part of the body is the earth.
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post #4 of 7 (permalink) Old 04-01-2019, 06:12 PM
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Try to open the trunk with the metal part of your key FOB the old fashioned way.

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post #5 of 7 (permalink) Old 04-04-2019, 03:11 AM
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He did...and it opened...partly.
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post #6 of 7 (permalink) Old 04-22-2019, 01:24 PM Thread Starter
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It’s resolved now: I connected a lithium jump starter to the aforementioned leads, which allowed current through the car’s circuits. I then was able to open my trunk using the automatic lifts, then I replaced the battery with an made-in-Germany AGM from Walmart.

From what I know about battery tenders, they require a certain resistance across its leads to charge a battery. AGM batteries have very low resistance, so my battery tender may have “seen” it as a short circuit.

By the way, I did not try to force the trunk open, even though the latch opened and allowed the trunk to open maybe an inch and a half. Who knows what might have been damaged from that.

Thanks everyone for your help.
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post #7 of 7 (permalink) Old 04-22-2019, 02:57 PM Thread Starter
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Quote:
Originally Posted by renault12ts View Post
Red is the positive...and any metal part of the body is the earth.
The weird part here is that the area under the passenger footwell has two (2) red leads. I would connect to the battery directly if I could, but the battery is in the trunk with these cars, and I could not access it because of the hydraulic lift. I used the thicker red connection in the picture. That one connects straight to the battery.

Also, there are few grounds in the footwell area, since my car’s metal components there are mostly painted. I was able to use a stray bolt in there as a lead, and it was small and hard to attach to.
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