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-   -   Strange Charging problem (https://mbworld.org/forums/e-class-w211/742562-strange-charging-problem.html)

J911brick 04-22-2019 11:13 AM

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?

J911brick 04-22-2019 11:49 AM

Does this car have the Aux battery and if so where is it. Its not under the charcoal filer.

jimbo1763 04-22-2019 12:01 PM

No aux battery on a 2008.

J911brick 04-22-2019 12:09 PM


Originally Posted by jimbo1763 (Post 7738550)
No aux battery on a 2008.

Thanks

05w211wagon 04-24-2019 10:54 AM

what brand of alternator did you purchase?

ygmn 04-24-2019 11:00 AM

Did you get battery tested?

J911brick 04-24-2019 04:33 PM


Originally Posted by 05w211wagon (Post 7740502)
what brand of alternator did you purchase?

Valeo

J911brick 04-24-2019 04:34 PM


Originally Posted by ygmn (Post 7740508)
Did you get battery tested?

Yes, several times.

J911brick 04-24-2019 04:37 PM

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).

05w211wagon 04-24-2019 04:38 PM

I would get a bosch or oem alternator these cars are pretty suborn about their alternators.

mrmotoguzzi00 04-24-2019 04:39 PM

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....

J911brick 04-24-2019 04:39 PM

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.

J911brick 04-24-2019 05:24 PM


Originally Posted by 05w211wagon (Post 7740789)
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?

J911brick 04-24-2019 05:27 PM


Originally Posted by mrmotoguzzi00 (Post 7740790)
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.

J911brick 05-03-2019 10:38 PM

Turns out problem was alternator. Replaced with New Valeo unit.


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