Mercedes-Benz 2009 GL320 BlueTEC Operator's Manual page 413

If the battery is discharged, the engine can be
started with jumper cables and the battery of
another vehicle. Observe the following:
Jump starting should only be performed
R
when the engine and catalytic converter
are cold.
Do not start the engine if the battery is
R
frozen. Let the battery thaw out first.
Only jump start from batteries with the
R
same voltage rating (12 V). Jump starting
with a more powerful battery could damage
the vehicle's electrical system, which will
not be covered by the Mercedes-Benz
Limited Warranty.
Only use jumper cables with sufficient
R
cross-section and insulated terminal
clamps.
Always make sure the jumper cables are
R
not on or near pulleys, fans or other parts
that move when an engine is started or
running.
The jump-start contacts are located in the
engine compartment on the passenger side.
19 Vehicles with gasoline engine only.
19
Negative terminal
1
Positive terminal
2
Positive terminal cover
3
X
Make sure the two vehicles do not touch.
X
Switch off all electrical consumers.
X
Engage the parking brake.
X
Make sure the automatic transmission is in
park position P.
X
Open the hood.
X
Flip up cover of positive terminal
3
direction of arrow.
X
Remove cover from negative terminal 1.
Negative terminal
1
Positive terminal
2
Positive terminal of charged battery
4
Negative terminal of charged battery
5
! Never invert the terminal connections!
X
Connect positive terminal
charged battery with positive terminal
with a jumper cable. Clamp the cable to
positive terminal
4
first.
in
2
X
Start engine of the vehicle with the charged
battery and run at idle speed.
X
Connect negative terminal
charged battery with negative terminal
with a jumper cable. Clamp the cable to
Practical hints
Jump starting
of the
4
2
of the charged battery
of the
5
1
Z
411