Mercedes-Benz 2013 GL Class - Manual (Page 388)

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Do not start the engine if the battery is frozen. Let the battery thaw first.
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Only jump-start from batteries with a 12 V voltage rating.
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Only use jumper cables which have a sufficient cross-section and insulated terminal clamps.
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If the battery is fully discharged, leave the battery that is being used to jump-start connected
for a few minutes before attempting to start. This charges the empty battery a little.
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Make sure that the two vehicles do not touch.
Make sure that:
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the jumper leads are not damaged.
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when the jumper cables are connected to the battery, uninsulated sections of the terminal
clamp do not come into contact with other metal sections.
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the jumper cables cannot come into contact with parts such as the V-belt pulley or the fan.
These parts move when the engine is started and while it is running.
X Secure the vehicle by applying the electric parking brake.
X Shift the transmission to position P.
X Turn the SmartKey to position 0 in the ignition lock and remove it ( Y page 159). On vehicles
with KEYLESS-GO, make sure the ignition is switched off ( Y page 159). All indicator lamps
in the instrument cluster must be off.
X Switch off all electrical consumers (e.g. radio, blower, etc.).
X Open the hood ( Y page 360).
Position number B identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
X Slide cover : of positive terminal ; in the direction of the arrow.
X Connect positive terminal ; on your vehicle to positive terminal = of donor battery B
using the jumper cable, always begin with positive terminal ; on your own vehicle first.
X Start the engine of the donor vehicle and run it at idling speed.
X Connect negative terminal ? of donor battery B to ground point A of your vehicle using
the jumper cable, connecting the jumper cable to donor battery B first.
386
Jump-starting
Breakdown assistance