2005 Mercedes SLK-Class Owner's Manual - Page 400

Practical hints Jump starting Warning! G Start the engine of the vehicle with the charged battery and run at idle speed. Connect negative terminal 4 of the charged battery with negative under hood terminal 3 in front of the discharged battery with the second jumper cable. Clamp the cable to negative terminal 4 of the charged battery first. 1 Positive terminal of charged battery 2 Positive under hood terminal in front of discharged battery 3 Negative under hood terminal in front of discharged battery 4 Negative terminal of charged battery Connect positive terminal 1 of the charged battery with positive under hood terminal 2 in front of the discharged battery with one jumper cable. Clamp the cable to positive terminal 1 of the charged battery first. Start the engine of the disabled vehicle. You can now switch on the electrical consumers. Do not switch on the lights under any circumstances. Remove the jumper cables first from negative terminals 3 and 4 and then from positive terminals 2 and 1. You can now switch on the lights. Have the battery checked at the nearest authorized Mercedes-Benz Center. Keep flames or sparks away from battery. Do not smoke. Observe all safety instructions and precautions when handling automotive batteries ( page 294). Make sure the two vehicles do not touch. Switch off all electrical consumers. Apply parking brake. Shift gear selector lever* to position P (manual transmission to Neutral). Open the hood ( page 287). Remove the cover from positive under hood terminal 2 in front of discharged battery. ! Never invert the terminal connections. i Vehicles with automatic transmission*: Do not tow-start vehicle. 400