How to Jump Start a GMC T Series

1. Check that the other vehicle has a 12-volt battery system with a negative ground.
2. Park the vehicles close enough for the cables to reach, but not touching each other.
3. Set the parking brake on both vehicles, with automatic in P (PARK) or manual in N (Neutral).
4. Connect the other end of the negative (−) cable at least 18 inches (45 cm) from the dead battery, away from moving engine parts.
5. Start the vehicle with the good batteries and let the engine run for a while, using high idle if equipped.
6. Try to start the vehicle with the dead batteries.
7. To remove the cables, disconnect the negative (−) cable from the formerly dead vehicle first, then the good vehicle, then the red positive (+) cable from the good vehicle, then the other vehicle.

• Pages provided do not show the middle connection steps (3 to 8) for the first cable connections.
• If it will not start after a few tries, it probably needs service.
• Connecting or removing cables in the wrong order can cause shorting and damage not covered by warranty.

Source: 2010 GMC T Series owner's manual, PDF pages 190, 193, 194. Steps are summarized in our own words (AI-assisted, checked against the cited pages 2026-10-18). Other model years can differ; your manual has the final word.