2003 Mercedes E-Class Owner's Manual - Page 346

Practical hints Jump starting Jump starting Warning! If the battery is discharged, the engine can be started with jumper cables and the battery of another vehicle. Observe the following: Jump starting should only be performed when the engine and catalytic converter are cold. Do not start the engine if the battery is frozen. Let the battery thaw out first. Only jump start from batteries with the same voltage rating. Use only jumper cables with sufficient cross-section, insulated terminal clamps and polarity reversal protection. G ! Jump starting may only be performed on the main battery installed in the trunk. Avoid repeated and lengthy starting attempts. Do not attempt to start the engine using a battery quick charge unit. If the engine does not run after several unsuccessful starting attempts, have it checked at the nearest authorized Mercedes-Benz Center. Excessive unburned fuel generated by repeated failed starting attempts may damage the catalytic converter. Make sure the jumper cables do not have loose or missing insulation. Make sure the cable clamps do not touch any other metal part while the other end is still attached to a battery. Failure to follow these directions will cause damage to the electronic components, and can lead to a battery explosion and severe injury or death. Never lean over batteries while connecting or jump starting, you might get injured. Battery fluid contains sulfuric acid. Do not allow this fluid to come in contact with eyes, skin or clothing. In case it does, immediately flush affected area with water, and seek medical help if necessary. A battery will also produce hydrogen gas, which is flammable and very explosive. Keep flames or sparks away from battery, avoid improper connection of jumper cables, smoking etc. Read all instructions before proceeding. i Jumper cables with polarity reversal protection are available at any authorized Mercedes-Benz Center. 346