Mercedes-Benz SL Roadster 2012 Owner's Manual page 591

Towing and tow-starting
588
Position number B identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
Press cover : of positive terminal ; down (in the direction of the arrow) and turn it
X
clockwise. Cover : is held down in the lowered position, which exposes positive termi-
nal ;.
Connect positive terminal ; on your vehicle to positive terminal = of donor battery B
X
using the jump lead. Always begin with positive terminal ; on your own vehicle first.
Start the engine of the donor vehicle and run it at idling speed.
X
Connect negative terminal ? of donor battery B to earth point A of your vehicle using the
X
jump lead, connecting the jump lead to donor battery B first.
Start the engine.
X
Before disconnecting the jump leads, let the engines run for several minutes.
X
First, remove the jump leads from earth point A and negative terminal ?, then from pos-
X
itive clamp ; and positive terminal =. Begin each time at the contacts on your own vehicle
first.
After removing the jump leads, press down cover : of positive terminal ; and turn it anti-
X
clockwise. Cover : returns to its original position. Positive terminal ; is covered up and
thus insulated again.
Have the battery checked at a qualified specialist workshop.
X
i
Jump-starting is not considered to be a normal operating condition.
i
Jump-starting 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 the weight of the vehicle to be towed or tow-
started is greater than the permissible gross
weight of your vehicle:
the towing eye could detach itself
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the vehicle/trailer combination could over-
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turn.
There is a risk of an accident.
When towing or tow-starting another vehicle,
its weight should not be greater than the per-
missible gross weight of your vehicle.
! If DISTRONIC PLUS or the HOLD function
is activated, the vehicle brakes automati-
cally in certain situations. To prevent dam-
age to the vehicle, deactivate DISTRONIC
PLUS and the HOLD function in the follow-
ing or other similar situations:
when towing the vehicle
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in the car wash
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! Only secure the tow rope or towing bar to
the towing eyes. The vehicle may otherwise
be damaged.
! Observe the following points when towing
with a tow rope:
secure the tow rope on the same side on
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both vehicles.
make sure that the tow rope is not longer
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than legally permitted. Mark the tow rope
in the middle, e.g. with a white cloth
(30 x 30 cm). This makes other road