How to Jump-Start a Car Safely

Steps

1. 
   1

   Read Your Owner's Manual

   Consult the manual for your specific vehicle's recommended jump-start procedure and the location of the battery and jump-start terminals.

2. 
   2

   Position the Vehicles

   Park the working vehicle close to the dead vehicle, about 18 inches apart. Make sure both vehicles are turned off and in park or neutral with the parking brake engaged.

3. 
   3

   Turn Off Accessories

   Turn off all electrical accessories in both vehicles — radio, air conditioning, lights, and any plugged-in devices. This reduces electrical load during the jump-start.

4. 
   4

   Locate the Batteries

   Open both hoods and locate the batteries. Some vehicles have remote jump-start terminals under the hood, often marked with a positive or negative symbol.

5. 
   5

   Identify Positive and Negative

   The positive terminal is marked with a plus sign (+) and is usually red. The negative terminal is marked with a minus sign (-) and is usually black. Clean any corrosion from the terminals with a wire brush.

6. 
   6

   Attach Red Cable to Dead Battery

   Attach one end of the red (positive) jumper cable to the positive terminal of the dead battery. Make sure the clamp is securely attached to clean metal.

7. 
   7

   Attach Red Cable to Working Battery

   Attach the other end of the red cable to the positive terminal of the working battery. Again, ensure a solid connection to clean metal.

8. 
   8

   Attach Black Cable to Working Battery

   Attach one end of the black (negative) cable to the negative terminal of the working battery. Secure the clamp firmly.

9. 
   9

   Attach Black Cable to Ground

   Attach the other end of the black cable to an unpainted metal surface on the dead vehicle's engine block or chassis — NOT to the negative terminal of the dead battery. This minimizes spark risk near the battery.

10. 
    10

    Verify Cable Connections

    Double-check that all four cable connections are secure and that cables are not touching each other except at the correct terminals.

11. 
    11

    Start the Working Vehicle

    Start the working vehicle and let it run for a few minutes to build up charge in the battery. Rev the engine slightly to increase alternator output.

12. 
    12

    Attempt to Start the Dead Vehicle

    Try starting the dead vehicle. If it doesn't start immediately, wait another minute with the working vehicle running and try again.

13. 
    13

    Remove Cables in Reverse Order

    Once the dead vehicle starts, remove the jumper cables in the exact reverse order of attachment: black cable from ground, black from working battery, red from working battery, red from dead battery.

14. 
    14

    Keep the Vehicle Running

    Keep the newly started vehicle running for at least 20-30 minutes to allow the alternator to recharge the battery. Do not turn it off immediately.

15. 
    15

    Check the Battery

    If the car starts but dies again shortly after, the battery may be failing and needs replacement. Test the battery and alternator at an auto parts store.

16. 
    16

    Drive to a Repair Shop

    If the battery is weak, drive directly to a repair shop or auto parts store for testing and replacement. Do not rely on a jump-start as a long-term solution.

17. 
    17

    Clean the Terminals

    After a successful jump-start, clean any remaining corrosion from the battery terminals using a wire brush and a mixture of baking soda and water.

18. 
    18

    Apply Terminal Protectant

    Apply a terminal protectant spray or grease to the cleaned battery terminals to prevent future corrosion buildup.

19. 
    19

    Inspect the Battery

    Check the battery for cracks, bulging, or leaking. A damaged battery should be replaced immediately — it poses a safety hazard.

20. 
    20

    Check the Alternator

    If the battery keeps dying, the alternator may not be charging properly. Have it tested at a repair shop to diagnose the issue.

21. 
    21

    Replace Old Batteries

    Car batteries typically last 3-5 years. If your battery is older than 4 years, consider replacing it proactively to avoid being stranded.

22. 
    22

    Carry Emergency Supplies

    Keep jumper cables, a flashlight, and safety gloves in your trunk at all times. Consider carrying a portable jump starter as a backup.

23. 
    23

    Learn Battery Maintenance

    Check your battery terminals monthly for corrosion and tightness. Add distilled water to flooded batteries if the level is low.

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    24

    Know When to Call a Professional

    If the battery is cracked, leaking, or you smell burning sulfur, do not attempt a jump-start. Call roadside assistance or a mechanic immediately.

25. 
    25

    Stay Safe

    Never lean over a battery while attaching cables, never touch cables together, and never smoke near a battery — batteries can emit explosive hydrogen gas.