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Discussion Starter #1
Has anyone else had issue with the 12v aux power outlet in the center console going bad, or not working to provide power to devices like a phone charger?

When I bought my car I noticed that no matter what brand, or type of 12v accessory charger I used none would work. Today I disassembled my console to get the the outlet after checking the fuses, etc and found that by using a multimeter I am in fact getting 12v switched when the ignition is on, but none of my device chargers will activate via the jack.

I have tried three different phones (HTC Desire, IPhone 4 and Motorola Tundra) along with a GPS device(TomTom 700), none are getting power from this jack.

I removed the jack and cleaned it pretty well, including scraping the electrode and corrosion from the metal inside.

I suspect it is one or two things; either the jack itself is damaged, thus facilitating a replacement or; the 12v jack from the factory doesn't offer enough amperage to power any of the devices I am trying.

Understanding I am referring to the traditional cigarette lighter as the 12v aux power outlet, is there anything different on these cars I should be considering, or does my diagnoses sound about right?

If it is the jack, anyone have a part number for just that little peice without having to do something crazy light buy a new console?
 

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Are you are getting 12 volts switched to the inside or outside of the outlet? A working cigarette lighter socket will give a lot more power than your devices need. If bad you can replace it with a generic 12 volt aux outlet or new lighter socket.
 

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Discussion Starter #3
I got 12v to the leads at the bottom of the socket, I wasn't sure where to place my leads on the actual socket itself. Thus I know I am getting 12V to the socket, I just am not sure and suspect the socket is bad, or a pin that I need is bent, etc.
 

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Premium Member 2014 SLK55 AMG
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How are you testing 12v at the socket, what are you using as 0v/gnd reference for your meter?

It COULD be that you have a loose ground on the socket so 12v gets there but no 0v reference on the socket so nothing works!

:) :) :) If you connect 12v directly to a 5v device you will quickly discover that electronic devices run on smoke; because the smoke will escape and the device will stop working! :) :) :)
 

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Premium Member 2004 SLK200K
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Premium Member 2004 SLK200K
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I got 12v to the leads at the bottom of the socket, I wasn't sure where to place my leads on the actual socket itself. Thus I know I am getting 12V to the socket, I just am not sure and suspect the socket is bad, or a pin that I need is bent, etc.
Do your chargers have a small led light that comes on , usually a good ( although not infalible ) way of telling if the socket is working ?
 

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I have some trouble with mine that I use a split usb outlet and sometimes there isn't enough power to charge two things.
Im sure I read in my handbook (R170) it states not to use the cigerette lighter socket for accessories Im sure someone will correct me if im wrong.

Dave
 

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That might be down to the split socket and depending on what you charge !
Often the split sockets have one with more amperage than the other and some appliances , especially iPads need higher amperage than a normal phone for instance !
 

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A typical 12 volt cigarette lighter will draw 10 amps @ 12 volts, which is plenty to charge IPads, laptops, and all sorts of stuff. I use mine for a 12v vacuum cleaner and tire compressor sometimes. I am sure that MB does not want you to use "accessories" because people will be plugging 12 volt fridges and other such stuff into it.
 

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Discussion Starter #11
I have had little time to look further into my issue over the past week, but I can think of no reason any 12V outlet would not at least charge a single device or at least as someone mentioned activate the LED on said charging device.

I am getting 12V on the power leads leading into my outlet, but did not try and measure voltage on the actual jack since I was not sure if ground was center or positive was. I just assumed the outlet was bad due to not working with a number of devices.

I have not heard anyone say that the 12V jack in the R170 are anything but, or they can not be used to power typical 12V devices, so will assume mine is bad. I would assume that others at least have gotten radar detectors to work, which I can not on mine.

I did look up the part number for the R170 outlet assembly and it is $79 from most online sources. Looks like I will be hunting for an aftermarket solution.
 

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There is nothing mystical about the cigarette lighter socket/12V outlet on an MB. They are made to a standard spec. The one Curro listed will be fine.

The outer part of the socket is -ve, the inner central connector is +ve. If you are checking for voltage using a DMM, it won't matter if you measure the wrong way round - it will just show -12.7V(ish) instead of a positive reading.

You sometimes find that when you plug an adaptor into the socket, it does not work. Often you need to give the adaptor a good wiggle/twist to get continuity.
 
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