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How to start the engine using jump leads
Fig. 171 How to connect the jump leads when starting vehicles without start/stop system:
discharged battery Ⓐ and battery providing assistance Ⓑ
Fig. 172 How to connect the jump leads when starting vehicles with start/stop system: discharged
battery Ⓐ and battery providing assistance Ⓑ
First read and observe the introductoryinformation and safety warnings⇒
Introduction
Vehicle with discharged battery that is being jump-started.
Vehicle with vehicle battery that is supplying power and jump-starting the other vehicle.
Suitable earth connection. A solid metal part that is firmly bolted to the engine block, the
engine block itself or, where fitted, the screwed-in towing eye at the front ⇒ Tow-starting and
towing.
Using the jump leads incorrectly or completing the jump start procedure incorrectly can cause
the battery to explode, which can lead to severe injuries. Please note the following in order to
reduce the risk of the battery exploding:
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The discharged vehicle battery must be properly connected to the vehicle's electrical system.
The vehicles must not touch. Otherwise electricity could flow as soon as the positive terminals are
connected.
Ensure that the battery clamps have good metal-to-metal contact with the battery terminals.
If the engine does not start immediately, switch off the starter after about 10 seconds and try again
after about half a minute.
The steps should only be carried out in the specified order.
Attaching the jump leads
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⇒ Fitting the front towing eye
⇒ Driving tips when towing
Observe any legal requirements when towing or tow-starting.
For technical reasons, vehicles with a discharged battery must not be tow-started.
For technical reasons, vehicles with an automated manual gearbox must not be tow started
unless it has been ascertained that the gearbox is in position N⇒ When a vehicle with an
automated manual gearbox has to be towed:.
Towing a vehicle when the engine is switched off and the ignition is switched on discharges the
vehicle battery. In some vehicles battery charge level, the drop in voltage can be large enough after
just a few minutes that electrical consumers in the vehicle will no longer function, e.g. the hazard
warning lights.
Additional information and warnings:
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