Question about Mercedes-Benz C230

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C230 Key Won`t Turn the car only went i use 14.3V

C230 Key Won`t Turn the car on 12.8v, will start only with 14.3v , new battery

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  • Anonymous Apr 01, 2014

    When I put the key in the dash sometimes does not light up and it keeps bleeping but car won't start

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The starter is turning only when the solenoid close the contact to deliver the current to the starter . When this happens it then turns the bendix to engage with the flying wheel to start the engine.
The reason that you need higher voltage to have correct needed current going through the contact of the solenoid, hence the starter. The contact is corroded or rusty due to high spark at high current at every start time causing high resistance. V=IR the R resistance of the contact now is high so it need higher voltage (14.3 vs, 12.8 V) to deliver the same needed current for the starter.
Unfortunately, the solenoid is integrated with the starter, so you can not just replace the solenoid without replacing the starter.
If you can find the new battery holding at 14.3 V as you mentioned, then that is an economical solution since replacing the starter is costing more.
BTW where can I find the battery at 14.3V in case my friend's car has a same problem?

Posted on Jul 27, 2009

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Posted on Jan 02, 2017

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