Question about Mercedes-Benz C-Class
The battery (or IGN) indicator on the dash, when lit, indicates that the alternator is not charging.
Check the battery terminals are not corroded, and the battery +12V and earth connections to the vehicle are in good order.
Check battery electrolyte lvel is ok.
Check the battery terminal voltage - it should be 13.8volts to 14.5 volts with the engine running. Switching on the headlights should not cause any reduction in that voltage while the engine is running.
The battery will not charge significantly unless the terminal voltge is in excess of 13.0V.
If all the above test ok, and the battery discharges between daily vehicle uses you may need a new battery.
Posted on Jun 17, 2009
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Posted on Jan 02, 2017
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Your battery are okay but you may have an alternator/generator problem, it's not charging back electricity to the battery. That's the common interpretation of that battery warning light on the dash...
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Hello and welcome to FixYa!
If the battery light is on, I strongly suggest that you have
the battery charged. It can be an indication of a weak battery or a faulty
alternator. If the battery light still on after charging then the problem will
surely be on the alternator itself. If that's the case the alternator should be
replaced to resolve the problem.
If the battery won't hold charge even on a new alternator
then the problem will be on the battery itself. It surely is in the end of it's
service life and replacement will be necessary.
You may try to reset it to by removing the positive battery
connector, letting it sit for at least 5mins. then reconnect it again. This
will reset the system and can get the battery light off.
Hope this helps and thank you for using FixYa! Have a good one!
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