What should I do if my battery warning light comes on?
The battery warning lamp indicates a malfunction in charging, such as problems due to starting issues or alternator faults. If it appears in the instrument cluster during driving, have the vehicle checked at an authorized Mercedes-Benz Center (Page 251).
From the official Mercedes Benz Mercedes Benz C Class 2008 2014 Fuses And Fuse Box Diagram And Location manual, page 5
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