1997 GMC Sonoma Owner's Manual - Page 202

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 causea ground connection you don't want. You wouldn't be able to start your vehicle, and the bad grounding could damage the electrical systems. You could be injured if the vehicles roll. Set the parking brake firmly on each vehicle. Put an automatic transmission in PARK (P) or a manual transmission in NEUTRAL (N). If you have a four-wheel-drive vehicle with a manual transfer case shift lever, be sure the transfer case is not in NEUTRAL (N). 3. Turn off the ignition on both vehicles. Unplug I NOTICE: If you leave your radio on, it could be badly damaged. The repair wouldn'tbe covered by your warranty. I If your vehicle has air conditioning, the auxiliary electric fan under the hood can start even up when the engine not running and can injure is you. Keep hands, clothing and tools away from any underhood electric fan. unnecessary accessories plugged into the cigarette lighter, or accessory power outlets, if you have this option. 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! 5-4