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Fuse box diagram location and assignment of electrical fuses and relays for Mercedes-Benz M-Class ML280 ML300 ML320 ML350 ML420 ML450 ML500. Auxilary battery is typically located in one of these locations. This guide provides instructions on how to change the auxiliary battery also referred to as the small computer or secondary battery on Mercedes-Benz ML-Class W164 R-Class W251 and GL-Class X164 vehicles.
The left side of the dashboard.
Passenger side of dash. The left side of the dashboard. The aluminum alloy mounting bracket is very malleable and can be bent as needed to keep the auxiliary battery snug. I also used an aftermarket 12V 13mA auxiliary battery purchased for 15 from Battery Systems - their PN was UB1213 - almost a perfect fit.