2005 Jeep Wrangler Owner's Manual - Page 242

242 WHAT TO DO IN EMERGENCIES JUMP STARTING WARNING! To prevent personal injury or damage to clothing, do not allow battery fluid to contact eyes, skin, or fabrics. Do not lean over a battery when connecting jumper cables or allow cable clamps to touch each other. Keep open flames or sparks away from battery vent holes. Always wear eye protection when working with batteries. Do not use a booster battery or any other booster source that has a greater than 12-volt system, i.e. do not use a 24-volt power source. Your vehicle is equipped with a 12-volt battery. If it becomes necessary to use a booster battery, with jumper cables, to start the vehicle's engine because it's battery is discharged, the following procedure should be followed: Set the parking brake, place an automatic transmission in P (Park) (or N (Neutral) for a manual transmission). Turn off lights, heater, and other electrical loads. Observe charge indicator in the battery. If indicator is light or yellow, replace the battery. CAUTION! Use the "Jump Starting" procedure only when the charge indicator is dark in the center. Do not attempt jump starting when the battery charge indicator is bright or yellow. If the charge indicator is dark and has a green dot in the center, failure to start is not due to a discharged battery and the cranking system should be checked.