Question about 2006 Mercedes-Benz Mercedes Benz CLS500

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Battery not charging/visit workshop light on

Light is on- the message is shoing for at least four days but everything seems fine. I mean the battery is not getting flat, lights are bright, starting normally.

Can this message be a computer glitch or it is a sign that the battery is getting weak?

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Or could possible be the alternator over charging

Posted on Oct 05, 2009

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Posted on Jan 02, 2017

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Something in the vehicle could be draining the battery. Have you checked for a stuck brake light switch?

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You need to remove your positive connection at the battery first. Now you connect one end of test light to battery clamp, and the other to battery. Make sure they have good contact. Test light will light up anytime there is a draw. The brighter the light, the more draw there is. Start by removing one fuse at a time and watch for light to go out, or at least dim quite a bit, and leave it out & record which one it was. The ideal way to do it is to remove all fuses, making sure light is out completely, then start re-installing them and watch for one that light comes on bright. That will tell you which circuit is causing the excess draw. If you think that will get you in trouble, or confused, just pull one at a time and if no difference in light, put it back in. Just leave those that make light dimmer, out, making sure you note where they go. That way if you have 2 or 3 with slight draw, (like radio, clock etc.,) but 1 with big draw, then you can zero in on that circuit as the culprit. Take's a little time, but it works.

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you have an electrical problem, 562 is:
System Voltage Low(pasted from obd2 index, sorry for caps)
the battery light is not a battery light its a charge idiot lamp.
it means, the alternator can not charge the battery.
the light glowing means literally, the alterntator has shut down!
at that moment the battery begin is death spiral, that is its discharges until the EFI goes nuts, or spark goes weak
get a volt meter, connect it to the CIG light.
or go to any autostore in USA, cant speak for others.
and see the CIG lighter tester, its has LEDs to tell you
good bad or ugly, id never use this but id use a real DMM
connected to to the CIG light (i use this because its easy to get to)

now 12.6 vdc is battery charging.
start car and 13.3 to 15v is alternator is working. if not in this range
the (lower means shut down, higher means out of control (bad)

it is that simple, better cars have a voltmeter in the dash.
you have a blown fuse, to the ALT,
or bad wiring,
it can be just corroded battery cables. or ends.

keep in mind when the engine stalls, may ) lamps in the I.P cluster come one, this only signals you , the engine stalls.

look for coronation on all 4 paths from Alternator to battery.
that includes the Alterator Ground, (case)
keep and open mind, most alternators replaced are good.
this is because of 2 reasons, no meter. or doing the tests wrong.

i might add, that some batteries short a cell , every other speed bump, so just because it tests ok , now dont make it good.
is your battery 7 years old? (see date code on same) July 2006?

The alternator can be hard to diagnose, it can in fact shut down
at faults and this makes diagnosis hard. just knowing this one
fact , allows you to up the levels of testing.
also some cars the PCM controls the ALT .

so you do have a primary DC power distribution error.
Causing the Alternator to Shut down.

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The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
Also,do an overnight battery check by disconnecting the battery overnight,if things are fine the next morning after the battery was disconnected then it is a drain in the vehicle,if the battery is dead even after being disconnected overnight,,then the battery is bad.

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