1998 Chevrolet Astro Owner's Manual - Page 226

To avoid the possibility of the vehicles rolling, set the parking brakefirmly on both vehicles involved in the jump start procedure. Put anautomatic transmission in PARK (P). 3. Turn off the ignition on both vehicles. Unplug unnecessary accessories plugged into the cigarette lighter or accessory power outlets. Turnoff all lamps that aren't needed aswell as radios. This will avoid sparks and helpsave both batteries. In addition, it could save your radio! A CAUTION: 1 ng a match near a battery can cause battery gas to explode. People have been hurt doing this, and some have been blinded.Use a flashlightif you need more light. Be sure the battery has enough water. You don't need to add water to the Delco Freedom@ battery installed in every new GM vehicle. But if a battery has filler caps, sure the right be amount of fluid is there. If it is low, add water to take careof that first. If you don't, explosive gas could be present. Battery fluid contains acid that can burn you. 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 be badly damaged. The repairs wouldn't be covered by your warranty. 4. Open the hoods and locate the batteries. Find the positive (+) and negative (-) terminals on each battery.