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Car keeps dying, battery or alternator?

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Old 07-04-2014, 01:20 PM
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2010 c300/2008 335i
Car keeps dying, battery or alternator?
My 2010 C300 keeps on dying after it sits for a while. I put In the key, everything turns on inside the car. After I attempt to turn over the car, it makes no noise at all, no attempt to start.

I jump started it yesterday and let it ran for a while before turning it off again. Once I shut it off I tried to start it again and it fired up.

This morning same thing, dead again. Could this be an issue with the battery or alternator? Or worse? Could it have a drain?

Any advice would be appreciated.
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Old 07-04-2014, 03:19 PM
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W204 C350 & W212 E300
I had the same issue with my C350 the other day. Called MB roadside assistance, battery was shot, couldn't take any charge.... Get a new battery...
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Old 07-04-2014, 10:07 PM
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If your alternator were bad, some warning light on the dash would tell you (once the car was running). Its likely the battery.
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Old 07-05-2014, 08:13 PM
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C300 AMG SPORT
Dump this car and get a Lexus...the japs are building the most reliable cars on the planet. Don't believe me... look at the stats.
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Old 07-05-2014, 08:49 PM
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C300 Sport
Sounds like battery.
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Old 07-07-2014, 03:42 AM
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2011 E350 4 Matic
had the same happen to me in my 2011 c, battery was dead. When i dropped the car off the delaer blamed it on after market stuff (laser jammer and remote starter) had to remove it all for them to continue with diagnosis
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Old 07-09-2014, 11:54 AM
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2013 C250 Sport
had my battery die in my 2013 already. Roadside came out and replaced it. I've had 2 keyfob batteries die also. These cars have too many electronics
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Old 07-09-2014, 12:25 PM
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07 tsx, 09 c300
had the same issue this week, went to the dealer and had the battery replaced.
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Old 07-29-2014, 06:04 AM
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2008 C300 Sport, 2010 RX350 AWD
How much was your battery replacement cost?

Wondering if it is cheaper to have roadside change it or at dealership..
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Old 07-29-2014, 07:40 PM
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2012 C300 4Matic Sport, 2006 Ford F150 Lariat 4x4 5.4L
Originally Posted by justthinking
How much was your battery replacement cost?

Wondering if it is cheaper to have roadside change it or at dealership..
Per justthinking in this post: https://mbworld.org/forums/c-class-w...e-battery.html

"Local dealer want $90 labor for the swap and MB Roadside Assistance want $75 for the labor which seems excessive."

Alldata indicates a labor charge of 0.5 hours for Remove and Replace
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