kozmic
Member
My suggestion? Drop back and punt. Take it to the dealer and hope he's in the Christmas spirit!
IDK what year you have but a 2015 ML350 auxiliary battery is a AUX14. $125 at NAPA.
I shudder think what the dealer would want.
If You can't find an independent MB repair shop in Vegas, the dealer is the only option. Why do You have California plates in Vegas???
In the tradition of German over-engineering, there are actually two types of auxiliary battery depending on trim and model. They are typically called "big" and "small". The AUX14 the "big" auxiliary battery. I need the small one, about $55 from the M-B online parts store, and considerably less elsewhere.