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Strange Charging problem

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E-Class (W211) 2003-2009

Strange Charging problem

 
Old 04-22-2019, 11:13 AM
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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 04-22-2019, 11:49 AM
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Does this car have the Aux battery and if so where is it. Its not under the charcoal filer.
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Old 04-22-2019, 12:01 PM
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2007 E350 Sedan
No aux battery on a 2008.
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Old 04-22-2019, 12:09 PM
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Originally Posted by jimbo1763 View Post
No aux battery on a 2008.
Thanks
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Old 04-24-2019, 10:54 AM
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2005 e500 w211 wagon
what brand of alternator did you purchase?
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Old 04-24-2019, 11:00 AM
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Did you get battery tested?
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Old 04-24-2019, 04:33 PM
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Originally Posted by 05w211wagon View Post
what brand of alternator did you purchase?
Valeo
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Old 04-24-2019, 04:34 PM
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Originally Posted by ygmn View Post
Did you get battery tested?
Yes, several times.
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Old 04-24-2019, 04:37 PM
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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 04-24-2019, 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 04-24-2019, 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 04-24-2019, 04:39 PM
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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 04-24-2019, 05:24 PM
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Originally Posted by 05w211wagon View Post
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 04-24-2019, 05:27 PM
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Originally Posted by mrmotoguzzi00 View Post
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 05-03-2019, 10:38 PM
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Turns out problem was alternator. Replaced with New Valeo unit.
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