Q: I have 2 battery's in my merc I've charged both only 1 working

asked by on March 07, 2017

I charged both of my battery's in my car and only on working which only let's me start then car open and unlock the door but on my dashboard I says audio off what do I do next? Do I need a new battery or just a reset everything?

My car has 16000 miles.
My car has an automatic transmission.

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