If the jumper cables are used improperly and the
starting aid is used incorrectly, the 12-volt battery
may explode and cause serious injury. To reduce
this risk of explosion, observe the following:
•
Any work on the 12-volt battery and electrical
system can cause severe burns, fire and
shock.
electrical. Before working on the battery, always
read and observe the relevant warnings and
safety precautions → p. 252.
•
The battery supplying the current must have
the same voltage (12 volts) and approximately
the same capacity (printed on the battery
pack).
battery) than the discharged battery.
•
Never charge a 12-volt battery that is frozen
or has thawed. When the battery is
discharged, it may con-
gel at temperatures approaching 0 °C
(+32 °F).
•
Replace the 12-volt battery if it has been
charged, even if it has been disconnected.
•
During the starting aid, a highly explosive gas
mixture is formed in the 12-volt circuit. Always
avoid
sparks or fire, naked flames or burning
cigarettes in the vicinity of the battery. Never
use a mobile phone when connecting and
disconnecting the jump leads.
•
Lay the jumper cables in such a way that they
never come into contact with rotating parts of
the front end.
•
Never confuse the positive pole with the
negative pole and never connect the jumper
cables in the same way.
•
Observe the manufacturer's operating
instructions for the jumper cables.
Introduction to the topic
Tow starting can cause damage.
Socket for starting aid
(ground
terminal)
Start-up aid
For technical reasons, it is not permitted to start the
vehicle by towing → p. 234.
If the engine cannot be started because the 12-volt
battery is discharged, the 12-volt battery of another
vehicle can be used for this purpose.
Suitable jumper cables are required for the
starting aid.
The cross-section of the jumper cables must be:
—
For vehicles with petrol engine: minimum 25
mm2
(0,038
in2
)
To avoid considerable damage to the vehicle's
electrical system, please note the following:
•
If the jumper cables are connected incorrectly, a
short-circuit may occur.
•
Use only jumper cables with fully insulated
clamps.
•
Do not allow the vehicles to come into contact
with each other, otherwise current may start to
flow as soon as the positive poles are
connected.
Note and at the beginning of this
chapter
on page 234.
Fig. 161 On the engine compartment: socket for
starting aid (ground terminal).
The socket for the starting aid (ground terminal)
is used to connect the black starting cable →
fig. 161.
To receive starting aid, use only this socket (ground
terminal).
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