332 Jump-starting, tow-starting and towing away If the batteries are discharged, jump-start the vehicle by connecting to another vehicle. X Disconnect the positive terminal clamp of the jumps lead from the positive terminals. X Before jump-starting, disconnect any mobile communications systems, such as a telephone, 2-way radio, fax machine, from the electrical system. X Attach positive terminal clamp cap ; and negative terminal clamp cap : . X Fit the battery compartment cover ( Y page 307). X Make sure that the vehicles are not touch- ing. X Apply the parking brake. Jump-starting using the jump-starting socket X Switch off all electrical consumers.
G Warning If you jump-start a vehicle that requires too much current, the socket may become over- loaded. There is a risk of fire in the electrical system. Only jump-start vehicles of a similar vehicle type, e.g. lorries with an equal or lower power need. The vehicles must be equipped with a 24 V system or with two 12 V batteries con- nected in a series. X Turn the key to position 0 in the ignition lock. Jump-starting with jump leads Breakdown assistance G Warning If you insert the plug connector into the power socket, sparks could be created. If you are in the vicinity of highly flammable materials, e.g. fuel, there is a risk of fire and explosion.
Do not insert the plug connector into the power socket if you are in the vicinity of highly flammable materials. X To connect the jump leads: remove the battery compartment cover ( Y page 307). X Remove positive terminal clamp cap ; and negative terminal clamp cap : . X First, connect the positive terminal clamp of the jump lead to the positive terminal of the other vehicle's battery and then to the q positive terminal of the starter battery. X First, connect the negative terminal clamp of the jump lead to the negative terminal of the other vehicle's battery and then to the ± negative terminal of the starter battery. X Assisting vehicle: run the engine at a high speed.
X Start the engine and allow it to idle. X To disconnect the jump leads: first, dis- connect the negative terminal clamps of the jump leads from the negative terminals. X Remove battery compartment cover = ( Y page 307). X Donor vehicle and vehicle being jump- started: turn the key back fully in the igni- tion lock.