How to Jump Start a Chevrolet Trailblazer

1. Check that the jumper cables have no loose or missing insulation before using them.
2. Connect one end of the red positive (+) cable to the discharged battery positive (+) terminal.
3. Connect the other end of the red positive (+) cable to the good battery positive (+) terminal.
4. Connect one end of the black negative (–) cable to the good battery negative (–) terminal.
5. Connect the other end of the black negative (–) cable to the discharged battery negative (–) grounding point.
6. Start the engine of the vehicle with the good battery and let it idle for at least four minutes.
7. Try to start the vehicle with the dead battery; if it will not start after a few tries, it probably needs service.
8. To remove the cables, reverse Steps 6–9 in exact order.

• Connecting or removing cables in the wrong order can cause electrical shorting and damage not covered by warranty.
• Pushing or pulling the vehicle to start it will not work and could damage it.
• After starting, let the vehicle idle for several minutes once the cables are removed.

Source: 2026 Chevrolet Trailblazer owner's manual, PDF pages 260, 262. 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.