Mercedes-Benz 2011 GL-Class Operator's Manual page 328

Jump-starting
326
X
Shift the transmission to position P.
X
Switch off all electrical consumers (e.g. radio, blower etc.).
X
Open the hood (
Position number C identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
! Never swap the terminal connections.
X
Lift up cover : of positive terminal ; in the direction of the arrow.
X
Connect positive terminal ; on your vehicle to positive terminal = of donor battery C
using the jumper cable, beginning with your own battery.
X
Start the engine of the donor vehicle and run it at idling speed.
X
Remove cover A from earth point B.
X
Connect negative terminal ? of donor battery C to earth point B of your vehicle using
the jumper cable, connecting the jumper cable to donor battery C first.
X
Start the engine.
X
First remove the jumper cable from earth point B and negative terminal ?, then from
positive terminal ; and positive terminal =, each time disconnecting from the battery on
your own vehicle first.
X
Have the battery checked at a qualified specialist workshop, e.g. an authorized Mercedes-
Benz Center.
Y page 294).