Electrical system
Description and roadside assistance
61
Guidelines for Breakdown Services (Subject to technical modifications)
i
Jump starting
When the vehicle batteries are flat, another vehicle can be used to jump start the engine.
Risk of explosion G
While jump starting, deflagration may occur due to gases escaping from the batteries. Avoid producing
sparks. Do not use open flames near batteries, and do not smoke.
When handling batteries, always comply with the safety information and precautions, see page 62
!
Before jump starting, the condition of the batteries must be checked.
The vehicle must not be jump started when the batteries
• are visibly damaged
•are frozen
• or the fluid level has dropped below "Min." (see "Min./Max." mark on battery housing).
Replace the batteries.
Discharged batteries may freeze at temperatures of –10 °C. In this case do not start the engine. Let the
battery thaw out first.
Do not use a quick charger for jump starting.
Only jump start from two 12 V batteries connected in series or from vehicles with 24 V system.
Use jumper cables that are protected against reverse polarity and have a cross section of about 35–50 mm²
and insulated terminal clips.
Before jump starting with a mobile charging station (batteries with power supply unit), pull the mains plug.
Overvoltages can damage electronic components in the vehicle.
Do not connect the ground cable to the vehicle frame. This can cause damage to the engine or transmission
components.
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