Mercedes-Benz 2013 GL X166 Operator's Manual page 388

Jump-starting
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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
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for a few minutes before attempting to start. This charges the empty battery a little.
Make sure that the two vehicles do not touch.
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Make sure that:
the jumper leads are not damaged.
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when the jumper cables are connected to the battery, uninsulated sections of the terminal
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clamp do not come into contact with other metal sections.
the jumper cables cannot come into contact with parts such as the V-belt pulley or the fan.
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These parts move when the engine is started and while it is running.
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Secure the vehicle by applying the electric parking brake.
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Shift the transmission to position P.
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Turn the SmartKey to position 0 in the ignition lock and remove it (
with KEYLESS-GO, make sure the ignition is switched off (
in the instrument cluster must be off.
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Switch off all electrical consumers (e.g. radio, blower, etc.).
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Open the hood (
Position number B identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
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Slide cover : of positive terminal ; in the direction of the arrow.
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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.
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Start the engine of the donor vehicle and run it at idling speed.
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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.
Y page 360).
Y page 159). On vehicles
Y page 159). All indicator lamps