What Is An Auxiliary Battery
What Is An Auxiliary Battery . The car starts when the auxiliary battery dies, but an auxiliary battery malfunction appears on the dashboard. Please pardon the dumb question, but what does the aux. Battery Location and Accessibility?/I Need to Vent from www.mercedescla.org An auxiliary battery is a backup battery that is used to power the car's electrical system if the primary battery fails. It provides power to start the car and to run accessories like the radio, air conditioning, and lights. However, the mercedes service station does its alteration for $50 to $310;