Booster Cable Safety

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Booster Cable Safety

What should I know about using booster cables?

Sparks created from booster or jumper cables can ignite a flammable mixture of hydrogen in air causing an explosion.

Before using jumper cables:

  • Check vehicle/equipment service manual for specific requirements.
  • Wear eye protection.
  • Make sure that the two vehicles are not touching each other.
  • Turn off the ignition switches of both vehicles.
  • Extinguish all cigarettes, cigars, and other sources of flame or ignition. Remember, explosive mixtures of hydrogen are always present in the cells of batteries.
  • Remove the filler caps from both batteries to vent the dangerous hydrogen gas. This is not necessary if the vehicles are equipped with maintenance-free batteries.
  • Do not charge or jump a frozen battery.

WARNING: When connecting or disconnecting jumper cables, use extreme care when handling the clamps.

Do not allow cables to touch each other, nor to touch the frame or body of either vehicle to prevent sparks that can cause an explosion.

  • Avoid contact with the revolving cooling fans when disconnecting the cables.
  • After removing the booster cables, replace the filler caps on both batteries.

How do I boost a negatively grounded battery?

The vehicle is NEGATIVELY grounded when the cable attached to the NEGATIVE post of the “dead” battery is also attached to the engine block.

To connect cables:

  • Clamp one end of the red cable onto the positive post of the “dead” battery.
  • Clamp the other end of the red cable onto the positive post of the booster battery.
  • Clamp one end of the black cable onto the negative post of the booster battery.
  • Clamp the other end of the black cable onto the engine block below and away from the “dead” battery.
  • Start the engine of the booster vehicle, then the engine of the “dead” vehicle.

To disconnect cables:

  • Remove the black negative clamp from the engine block of the vehicle with the “dead” battery.
  • Remove the black negative clamp from the booster battery.
  • Remove the red positive clamp from the booster battery.
  • Remove the red positive clamp from the “dead” battery.

How do I boost a positively grounded battery?

The vehicle is POSITIVELY grounded when the cable attached to the POSITIVE post of the “dead” battery is also attached to the engine block.

To connect cables:

  • Clamp one end of the black cable onto the negative post of the “dead” battery.
  • Clamp the other end of the black cable to the negative post of the booster battery.
  • Clamp one end of the red cable onto the positive post of the booster battery.
  • Clamp the other end of the red cable onto the engine block below and away from the “dead” battery.
  • Start the engine of the booster vehicle, then the engine of the “dead” vehicle.

To disconnect cables:

  • Remove the red positive clamp from the engine block of the vehicle with the “dead” battery.
  • Remove the red positive clamp from the booster battery.
  • Remove the black negative clamp from the booster battery.
  • Remove the black negative clamp from the “dead” battery.

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