Mercedes-Benz 2013 C-Class Coupe Operator's Manual page 295

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 battery slightly.
Make sure that the two vehicles do not touch.
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Make sure that:
the jumper cables are not damaged.
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bare parts of the terminal clamp do not come into contact with other metal parts while the
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jumper cables are connected to the battery.
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.
Apply the parking brake firmly.
X
Move the selector lever to position P.
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Switch off all electrical consumers (e.g. radio, blower, etc.).
X
Open the hood ( page 274).
X
Y
Position number B identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
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
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using the jumper cable, beginning with your own battery.
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
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the jumper cable, connecting the jumper cable to battery of other vehicle B first.
Start the engine.
X
Before disconnecting the jumper cables, let the engine run for several minutes.
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First, remove the jumper cables from earth point A and negative terminal ?, then from
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positive clamp ; and positive terminal =. Begin each time at the contacts on your own
vehicle first.
Jump-starting
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