Mercedes-Benz G-Class 2012 Owners Manual - Manual (Page 234)

The jump-starting connection point is in the
engine compartment (
Y page 233).
X Open the hood ( Y page 210).
X Connect the battery charger to the positive
terminal and earth point in the same order
as when connecting the donor battery in
the jump-starting procedure
(
Y page 233).
X Read the battery charger's operating
instructions before charging the battery.
232
Battery
Breakdown assistance