2005 Mercedes CL-Class Owner's Manual - Page 392

Practical hints Jump starting ! Never invert the terminal connections. Start engine of the vehicle with the charged battery and run at idle speed. Connect negative terminals 2 and 4 of the batteries with the jumper cable. Clamp cable to charged battery 4 first. Start the engine of the disabled vehicle. Now you can again turn on the electrical consumers. Do not turn on the lights under any circumstances. Remove the jumper cables first from negative terminals 2 and 4 and then from positive terminals 1 and 3. You can now turn on the lights. Have the battery checked at the nearest authorized Mercedes-Benz Center. Warning! G Keep flames or sparks away from battery. Do not smoke. Observe all safety instructions and precautions when handling automotive batteries ( page 281). The battery is located on the right side of the trunk under the battery cover ( page 386). Make sure the two vehicles do not touch. Turn off all electrical consumers. Apply parking brake. Shift gear selector lever to position P. Open the trunk lid. Remove battery cover. Remove red cover from positive terminal 1. 1 Positive terminal of discharged battery 2 Negative terminal of discharged battery 3 Positive terminal of charged battery 4 Negative terminal of charged battery Connect positive terminals 1 and 3 of the batteries with the jumper cable. Clamp cable to charged battery 3 first. 390