Mercedes-Benz 2013 CL Operator's Manual page 446

Towing and tow-starting
444
Position number A identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
Remove the cover from positive terminal :.
X
Connect positive terminal : on your vehicle to positive terminal ; of donor battery A
X
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 A to ground point ? of your vehicle using
X
the jumper cable, connecting the jumper cable to donor battery A first.
Start the engine.
X
Before disconnecting the jumper cables, let the engine run for several minutes.
X
First remove the jumper cables from ground point ? and negative terminal =, then from
X
positive terminal : and positive terminal ;, each time disconnecting from the battery on
your own vehicle first.
Have the battery checked at a qualified specialist workshop.
X
i
Jump-starting is not considered to be a normal operating condition.
i
Jumper cables and further information regarding jump starting can be obtained at any
qualified specialist workshop.
Towing and tow-starting
Important safety notes
G
WARNING
If you tow the vehicle, you must use a rigid
towing bar if:
the engine is not running.
R
there is a brake system malfunction.
R
there is a malfunction in the power supply
R
or the vehicle's electrical system.
The power assistance for the steering and the
brake force booster do not work when the