Mercedes-Benz 2005 M-Class Operator's Manual page 294

Practical hints
Jump starting
Warning!
Keep flames or sparks away from battery.
Do not smoke.
Observe all safety instructions and precau-
tions when handling automotive batteries
( page 228).
The battery is located on the passenger
side of the engine compartment.
Make sure the two vehicles do not
touch.
Turn off all electrical consumers.
Apply parking brake.
Shift gear selector lever to position P.
Open the hood.
292
G
1 Positive terminal of charged battery
2 Negative terminal of charged battery
3 Negative terminal of discharged
battery
4 Positive terminal of discharged battery
Connect positive terminals 1 and 4
of the batteries with the jumper cable.
Clamp cable to positive terminal 1 of
charged battery first.
!
Never invert the terminal connections!
Start engine of the vehicle with the
charged battery and run at idle speed.
Connect negative terminals 2 and 3
of the batteries with the jumper cable.
Clamp cable to negative terminal 2 of
charged battery first.
Start the engine of the disabled vehi-
cle.
Now you can turn on the electrical
consumers. Do not turn on the lights under
any circumstances.
Remove the jumper cables first from
the negative terminals 3 and 2 and
then from positive terminals 4
and 1.
You can now turn on the lights.
Have the battery checked at the
nearest authorized Mercedes-Benz
Light Truck Center.
!
Do not tow-start the vehicle.