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E-Class (W211) 2003-2009

Strange Charging problem

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Old Apr 22, 2019 | 11:13 AM
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W211 W204
Strange Charging problem
08 E320. New to Mercedes, but not wrenching. The car doesnt charge, but if you disconnect the battery and hook it back up it will charge for a while, then stop again and battery voltage will drop till things start turning off. Disconnect the battery, jump start it and it will be charging at 14v again. battery is AGM and less than a year old, alternator replaced twice. What am I missing?
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Old Apr 22, 2019 | 11:49 AM
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W211 W204
Does this car have the Aux battery and if so where is it. Its not under the charcoal filer.
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Old Apr 22, 2019 | 12:01 PM
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2007 E350 Sedan
No aux battery on a 2008.
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Old Apr 22, 2019 | 12:09 PM
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W211 W204
Originally Posted by jimbo1763
No aux battery on a 2008.
Thanks
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Old Apr 24, 2019 | 10:54 AM
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2005 e500 w211 wagon
what brand of alternator did you purchase?
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Old Apr 24, 2019 | 11:00 AM
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Did you get battery tested?
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Old Apr 24, 2019 | 04:33 PM
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W211 W204
Originally Posted by 05w211wagon
what brand of alternator did you purchase?
Valeo
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Old Apr 24, 2019 | 04:34 PM
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W211 W204
Originally Posted by ygmn
Did you get battery tested?
Yes, several times.
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Old Apr 24, 2019 | 04:37 PM
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W211 W204
My thought right now is either the DME or imoilizer is not energizing the exciter circuit after the car has been turned off (possibly with setting the alarm).
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Old Apr 24, 2019 | 04:38 PM
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2005 e500 w211 wagon
I would get a bosch or oem alternator these cars are pretty suborn about their alternators.
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Old Apr 24, 2019 | 04:39 PM
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sounds like your left with questionable battery ? if you really want to confirm you could put a temp battery in there or borrow a known good one if you have another car.... rig a multimeter inside or under the wiper to watch it real time.... just tossing stuff out there....
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Old Apr 24, 2019 | 04:39 PM
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W211 W204
My thought right now is either the DME or imoilizer is not energizing the exciter circuit after the car has been turned off (possibly with setting the alarm).

Wiring diagrams would help.
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Old Apr 24, 2019 | 05:24 PM
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W211 W204
Originally Posted by 05w211wagon
I would get a bosch or oem alternator these cars are pretty suborn about their alternators.
You are probably right but I thought valeo was oem?
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Old Apr 24, 2019 | 05:27 PM
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W211 W204
Originally Posted by mrmotoguzzi00
sounds like your left with questionable battery ? if you really want to confirm you could put a temp battery in there or borrow a known good one if you have another car.... rig a multimeter inside or under the wiper to watch it real time.... just tossing stuff out there....
Trying to source another battery to borrow.
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Old May 3, 2019 | 10:38 PM
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Turns out problem was alternator. Replaced with New Valeo unit.
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