Fix a dead battery with jumper cables

A battery has a negative (-) and a positive (+). The poles are marked with the plus and minus sign, and they are indicated by the color red is positive (+) and black is negative (-). Important: car batteries can release flammable hydrogen gas. Always start by clamping the red jumper cable to the positive (+) terminal of the battery. Then you can follow the following order. Another sequence can cause sparks. Even the best car batteries could then explode and injury or cause death.


1. Find a moving car. Bring the vehicle to the car with the dead battery.

2. Make sure that both batteries have the same voltage. Batteries in a car are 12 volt, trucks and tractors but take advantage of a battery of 24 volts, or two 12 volt batteries connected in series. Never plug in a battery of 12 volts to a battery of 24 volts.

3. Place the cars so that the jumper cables are long enough to connect the two batteries. The cars are not touching.

4. Put both cars out of the engine. Open the hoods of both cars.

5. Put on both cars the lights, wipers, radio and other electronic accessories off. Make sure nothing is in the cigarette lighter. All this draws power and could damage during launch.

6. Make sure the jumper cables are not tangled. The clamps at the ends of the jumper cables are intended to be attached to the poles of the batteries. Never disconnect a negative to a positive pole. This can damage electronics.

7. Check the batteries for cracks, leaks, and other damage. If you discover damage, you should never try to use the jumper cables. In that case, call the roadside.

8. Attach ” first ” a red clamp to the positive (+) terminal of the dead battery. Then connect the other end of the red jumper cables to the positive (+) terminal of the good battery. Remember that the order in which you connect the terminals ” necessary ” is, so follow these steps correctly.

9. Attach black clamp to the negative (-) terminal of the good battery.

10. Attach the second black clamp to a piece of unpainted, grounded metal on the car with the dead battery. Do not clamp to the negative terminal on the dead battery-only do this if there is no alternative (in the tips we give some suggestions for where you can attach the second black clamp).

11. Start the moving car so that its battery and a battery can be recharged.

12. Let the car idle for five minutes before trying to start the other car. You may be able to give a little gas, so the speed is slightly higher.

13. Try to start the car with the dead battery. If nothing happens, you can wait another five minutes and then try again. Repeat until the car starts.

14. Remove the jumper cables to the batteries in reverse order. Start by removing the black clip of the piece of metal on the car with the dead battery. Then remove the black and red terminal of the good battery, and finally you can remove the red terminal on the dead battery.

15. Run the engine for at least twenty minutes with a little more speed than idle to recharge the battery.


  • It may be necessary to clean the terminals and cable clamps. Remove the battery cables and use a wire brush to remove any corrosion. Attach the clips to the battery and now try again with jumper cables to start the car.
  • Use a shiny piece of metal as a good soil to attach to your last clip. Lacquered, oily or rusted metal does not work. It’s best to use a bolt or another piece of excellent shiny metal. Some sparks may occur if you have found a good ground. It is strongly advised to confirm the last clip on the dead battery because sparks can then ignite the escaping gas.
  • The battery can not always find under the hood. Sometimes a battery in the trunk or a different place.
  • Read the instructions. Usually, instructions are attached to which are to be interpreted in the order in which the fixed terminals.
  • Some cars have special places where manufacturers made your jumper cables to connect, so in a different place than the battery. Probably manufacturers do that to minimize the risk of hydrogen gas flaring.
  • Let the moving car only leave after at least ten minutes. The empty battery the car needs charging a while, sometimes falling silent again and again you need to use the jumper cables.
  • Never use cheap off-wire wires. Use only heavy duty jumper cables of high quality.


  • Ensure that the cables do not cross as they are attached to the battery to each other.
  • Make sure everyone keeps a safe distance. Batteries can explode if you do something wrong.
  • Keep your face as far away from the battery.
  • Check all connections before starting the working car. Check again that all terminals are in the right place.
  • When a charging battery is escaping hydrogen gas, which can explode the battery. Therefore, you should not have all four terminals of the jumper cables attached to the two batteries. Do so only if there is no alternative. Keep a safe distance. An explosion caused by sparks.
  • Wear safety glasses and work gloves. Put them on before you begin. Let people stand without safety equipment away from both cars.
  • Never connect first the black and then the red cable: if you do and drop can cause a massive short circuit the red cable accidentally, the clip can be welded to the chassis.

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