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2002 Mercedes Benz C240 battery

Tiny
KRAMMAUI
  • MEMBER
  • 2002 MERCEDES BENZ C240
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 40,521 MILES
I just put in a new battery, cleaned off the terminals, and a week later it will not start. The in dash computer does not show any charging problems.
Sunday, September 13th, 2009 AT 9:17 PM

8 Replies

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Is engine cranking over or do you just get clicking when turning key?

If clicking, need to have your starter tested. If crank but no start, check spark at the plugs and ensure fuel pressure is correct.
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Sunday, September 13th, 2009 AT 9:21 PM
Tiny
KRAMMAUI
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  • 4 POSTS
It will start if I jump it. So I do not think it is the starter
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Sunday, September 13th, 2009 AT 9:28 PM
Tiny
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Okay, since it drove for a week on the new battery, it seems as if the alternator is actually at fault. If the alternator is weak it will not charge the battery properly, meaning that the vehicle will use the battery to run on. The battery will then drain dead within a few days. I suggest having the alternator tested to ensure it is charging properly.
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Sunday, September 13th, 2009 AT 9:54 PM
Tiny
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Thank you. Would the in dash computer show a charging problem is it was not charging?
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Sunday, September 13th, 2009 AT 10:00 PM
Tiny
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Most likely not until the battery is almost drained.
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Sunday, September 13th, 2009 AT 10:01 PM
Tiny
KRAMMAUI
  • MEMBER
  • 4 POSTS
It clicks, but If I jump it starts rightup. It does not say Undervoltage or any charging/battery problem on the dash computer
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Sunday, September 13th, 2009 AT 10:19 PM
Tiny
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Most part stores will test your charging system for free. Let me know how the test results read out.
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Sunday, September 13th, 2009 AT 10:21 PM
Tiny
SANJAY DEVANI
  • MEMBER
  • 2 POSTS
I believe I may have a similar problem. See my question under subject "Mercedes Benz C240 Battery or Alternator". Was it the Alternator in your case? If not, what was the root cause?
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Tuesday, December 22nd, 2009 AT 12:14 PM

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