Knowing how to jump start a car is a basic skill every driver should have. A dead battery can happen to anyone, and doing it wrong can damage your car’s electronics or cause injury. Follow these steps to get back on the road safely.
What You Need to Jump Start a Car
You need a set of jumper cables and another vehicle with a working battery. Make sure the cables are in good condition with no exposed wires. Park the cars close enough so the cables reach, but do not let them touch. Turn off both vehicles, remove the keys, and engage the parking brakes.
How to Connect the Jumper Cables
Connecting the cables in the wrong order can cause sparks or damage. Follow this sequence carefully:
- Attach one red clamp to the positive terminal of the dead battery. The positive terminal is usually marked with a plus sign and may have a red cover.
- Attach the other red clamp to the positive terminal of the good battery.
- Attach one black clamp to the negative terminal of the good battery.
- Attach the last black clamp to an unpainted metal surface on the engine block of the dead car, away from the battery. This grounds the connection and reduces spark risk near the battery.
Start the Working Car and Let It Run
Start the working car and let it run for a few minutes. This allows the dead battery to receive some charge. Rev the engine slightly to increase alternator output, but do not race it excessively. After a few minutes, try starting the dead car. If it does not start, wait a couple more minutes and try again. If it still does not start, there may be another issue.
Disconnecting the Cables in Reverse Order
Once the dead car starts, disconnect the cables in reverse order. Remove the black clamp from the grounded metal surface first, then the black clamp from the good battery. Remove the red clamp from the good battery, and finally the red clamp from the formerly dead battery. Be careful not to let the clamps touch each other or any metal surfaces.
Drive the Car to Recharge the Battery
After a successful jump start, drive the car for at least 20 minutes to allow the alternator to recharge the battery. Avoid turning off the engine too soon, or it may not start again. If the battery dies again quickly, it may need to be replaced or there could be an issue with the charging system.
Safety Tips and Common Mistakes
Always wear safety glasses and gloves when jump starting. Never connect the negative cable directly to the dead battery’s negative terminal, as this can cause sparks and potentially ignite hydrogen gas. Do not lean over the batteries while connecting cables. Ensure both vehicles are off before connecting. If you are unsure, consult your owner’s manual or call for professional help.
Frequently Asked Questions
Can I jump start a car with a dead battery using a hybrid or electric car?
It is not recommended to use a hybrid or electric car as the donor vehicle unless the owner's manual explicitly allows it. The electrical systems are different and could be damaged. Use a conventional gas powered car instead.
What if my car has a start stop battery? Can I jump start it normally?
Yes, you can jump start a car with a start stop battery using the same procedure. However, some start stop systems have specific jump start points. Check your owner's manual for the correct location to connect the cables.
How long should I let the working car run before trying to start the dead car?
Let the working car run for about 2 to 3 minutes before attempting to start the dead car. If the dead battery is very depleted, you may need to wait 5 minutes or more. Revving the engine slightly can help.
