Mercedes-Benz Mercedes-AMG SL Roadster 2021 Owner's Manual page 340

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Take care to connect only battery terminals of
R
identical polarity.
Observe the sequence described for connect-
R
ing and disconnecting the jumper cables.
V V ehicles wit
ehicles with a pe
h a petr trol engine:
ol engine: jump-start the
R
vehicle only when the engine and exhaust sys-
tem are cold.
S S t t ar arting assist
ting assistance and c
ance and char
harging t
ging the 12 V batt
R R eq equir uirements:
ements:
The vehicle is secured with the electric park-
R
ing brake.
V V ehicles wit
ehicles with aut
h automatic tr
omatic transmission:
ansmission: the
R
transmission is in position j.
The vehicle and all electrical consumers are
R
switched o .
The bonnet is open.
R
he 12 V battery
ery
Example: engine compartment
Slide cover
#
jump-starting connection point in the direction
of the arrow.
Connect positive contact
#
to the positive terminal of the donor battery
using the jump lead/charging cable. Always
2
of positive contact
1
on the
1
on your vehicle
Breakdown assistance 337
begin with positive contact
vehicle rst.
During st
Dur
ing star arting assist
ting assistance:
ance: start the engine of
#
the donor vehicle and run at idle speed.
Connect the negative terminal of the donor
#
battery and earth point
3
by using the jump lead/charging cable. Begin
with the donor battery rst.
During st
Dur
ing star arting assist
ting assistance:
ance: start the engine of
#
your own vehicle.
During t
Dur
ing the c
he char
harging pr
ging process:
ocess: start the charg-
#
ing process.
During st
Dur
ing star arting assist
ting assistance:
ance: let the engines run
#
for several minutes.
During st
Dur
ing star arting assist
ting assistance:
ance: before disconnect-
#
ing the jump lead, switch on an electrical con-
sumer on your own vehicle, e.g. the rear win-
dow heater or lighting.
When the starting assistance/charging process is
complete, perform the following steps:
First, remove the jump lead/charging cable
#
from earth point
3
and the negative terminal
337
1
on your own
of your own vehicle

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