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243If and when
Jump leads
Jump leads must comply with standard DIN 72553 (see cable manufactur-
er's instructions). The wire cross section must be at least 25 mm
2
for petrol
engines and at least 35 mm
2
for diesel engines.
Note
● The vehicles must not touch each other, otherwise electricity could flow
as soon as the positive terminals are connected.
● The discharged battery must be properly connected to the on-board net-
work.
How to jump start: description
Fig. 168 Diagram of con-
nections for vehicles
without Start-Stop sys-
tem
Fig. 169 Diagram of con-
nections for vehicles
with Start-Stop system
Jump lead terminal connections
1. Switch off the ignition of both vehicles ⇒
.
2. For vehicles without Start-Stop system:
– Connect one end of the red jump lead to the positive
+
termi-
nal of the vehicle with the flat battery
A
⇒ Fig. 168.
– Connect the other end of the red jump lead to the positive ter-
minal
+
in the vehicle providing assistance
B
.
– Connect one end of the black jump lead to the negative terminal
–
of the vehicle providing assistance
B
⇒ Fig. 168.
– Connect the other end of the black jump lead
X
to a solid met-
al component bolted to the engine block or to the engine block
itself of the vehicle with the flat battery. However, connect it to
a point as far as possible from the battery
A
.
3. For vehicles with Start-Stop system:
Safety First Operating Instructions Practical Tips Technical Specifications
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