1999 GMC Envoy Owner's Manual - Page 224
1999 GMC Envoy Manual
Page 224 highlights
yellowblue 9. Attach the cable at least 18 inches (45 cm) away from the dead battery, but not near engine parts that move. The electrical connection is just as good there, but the chance of sparks getting back to the battery is much less. 12. Remove the cables in reverse order to prevent electrical shorting. Take care that they don't touch each other or any other metal. 10. Now start the vehicle with the good battery and run the engine for awhile. 11. Try to start the vehicle with the dead battery. If it won't start after a few tries, make sure all connections are good. If it still won't start, it probably needs service. A. Heavy Metal Engine Part B. Good Battery C. Dead Battery CAUTION: Fans or other moving engine parts can injure you badly. Keep your hands away from moving parts once the engine is running. 5-6