1997 GMC Suburban Owner's Manual - Page 244

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, and radios. This will avoid sparks and help save both batteries. And it could save your radio! A CAUTION: Using a match near a battery can cause battery gas toexplode. People have been hurt doingthis, and some havebeen blinded. Use a flashlight if you need more light. Be sure the batteries have enough water. You don't need toadd water to the Delco Freedom@ battery (or batteries) installedin every new GM vehicle. But if a battery has filler caps, sure be the right amount fluid is there.If it is low, add of of water to take care that first.If you don't, explosive gas could present. be you. Battery fluid contains acid that can burn Don't get it on you. If you accidentally get it in your eyes or on your skin, flush the place with water and get medical help immediately. NOTICE: ~~ __ If you leave your radio on, it could badly be damaged. The repairs wouldn'tbe covered by your warranty. 4. Open the hoods and locate the batteries. Find the positive (+) and negative (-) terminals on each battery. If your vehicle has air conditioning, the auxiliary electric fan under the hood can start up even when the engineis not running and can injure you. Keep hands, clothing and tools away from any underhood electric fan. 5-4