2003 Hummer H2 Owner's Manual - Page 306

2. Get the vehicles close enough so the jumper cables can reach, but be sure the vehicles aren't touching each other. If they are, it could cause a ground connection you don't want. You wouldn't be able to start your vehicle, and the bad grounding could damage the electrical systems. To avoid the possibility of the vehicles rolling, set the parking brake firmly on both vehicles involved in the jump start procedure. Put an automatic transmission in PARK (P) or a manual transmission in NEUTRAL before setting the parking brake. 3. Turn off the ignition on both vehicles. Unplug unnecessary accessories plugged into the cigarette lighter or accessory power outlets. Turn off all lamps that aren't needed as well as radios. This will avoid sparks and help save both batteries. In addition, it could save your radio! 4. Open the hoods and locate the positive (+) and negative (-) terminal locations on the other vehicle. Your vehicle has a remote positive (+) jump starting terminal and a remote negative (-) jump starting terminal. The remote positive (+) terminal is located behind a red plastic cover near the engine accessory drive bracket. See "Engine Compartment Overview" in the Index for more information on location. To uncover the remote positive (+) terminal, open the red plastic cover. The remote negative (-) terminal, marked "GND," is located on the engine accessory drive bracket. See "Engine Compartment Overview" in the Index for more information on location. You should always use the remote positive (+) and the remote negative (-) terminals instead of the positive (+) and negative (-) terminals on your battery. NOTICE: If you leave your radio on, it could be badly damaged. The repairs wouldn't be covered by your warranty. 5-4