Will driving the car recharge an auxiliary battery?

Asked by RayCorob Sep 13, 2016 at 09:59 AM about the 2012 Mercedes-Benz E-Class E 350 BlueTEC Sport

Question type: Maintenance & Repair

main battery ran down recharged it.

2 Answers
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GuruSP1GQ answered 4 years ago

Why I can't take off the cover to change the auxiliary battery GLK 350. 2014

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GuruP5Z9H answered 4 years ago

The systems is designed so that the main battery gets fully charged before power is given to the aux battery. Therefore, if there is a bad main battery that has a lower than normal voltage, the aux. battery will not get any charge and eventually will have a lower than normal voltage. I once have a bad main battery and the dash shows a bad aux. battery. After replacing the main battery and driving the car around for a while, the error message on the aux. battery goes away as it gets charged.

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