How to Jump Start a Chevrolet Blazer

1. Check that the other vehicle has a 12-volt battery with a negative ground system, and park the two vehicles so they do not touch.
2. Set the parking brake, shift into P (Park), turn the ignition off, and switch off all lights and accessories in both vehicles.
3. Check that the jumper cables have no loose or missing insulation.
4. Connect one end of the red positive (+) cable to the positive (+) terminal on the discharged battery.
5. Connect the other end of the red cable to the positive (+) terminal of the good battery.
6. Connect one end of the black negative (–) cable to the negative (–) terminal of the good battery.
7. Connect the other black end to the remote negative (–) terminal on the driver side shock tower of the discharged vehicle.
8. Start the good vehicle and idle it at least four minutes, then try starting the dead one.

• To remove the cables, reverse Steps 6–9 in exact order.
• If it will not start after a few tries, it probably needs service.
• Let the started vehicle idle for several minutes after the cables are removed.

Source: 2026 Chevrolet Blazer owner's manual, PDF pages 304, 305. 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.