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Jump-Starting Your Battery Using Another Car

Everything you need to know to do just that!

Step-by-step

  1. If possible, bring the two cars together nose to nose, about 18" apart. Be sure you're parked well away from traffic. Make sure both cars have their parking brakes on.
  2. Jump-Starting Your Battery Using Another Car
  3. Make sure both cars are turned off. Put automatic transmission cars in Park. Put manual transmission cars in Neutral. Set the parking brake firmly so the vehicle cannot move.
  4. Determine which terminals are positive and negative on both batteries. Look for "+" sign or red indicator for positive, "-" sign or black indicator for negative. The positive terminal is usually wider than the negative.
    Caution: Once you begin the next steps, do not touch the metal portion of the jumper cable clamps to each other or any part of the car except the proper battery terminal.
  5. The jumper cables are marked with colors or stripes to help you keep track of the two separate wires. Attach one end of the positive cable clamp to the positive terminal of the dead battery (the positive cable may have a stripe, or if the cables are marked with red and black, the red cable is positive).
  6. Attach the other end of the positive cable to the positive terminal of the good battery.
  7. Attach one end of the negative cable to the negative terminal of the good battery.
    YOUR CABLES ARE NOW LIVE! DO NOT TOUCH THE REMAINING CABLE CLAMP METAL PORTION TO YOURSELF OR ANY PART OF THE CAR EXCEPT THE NEGATIVE TERMINAL OF THE DEAD BATTERY.
  8. Attach the other end of the negative cable to a metal section (bracket, block, etc.) of the engine away from any moving parts (CAUTION: belts and pulleys can be dangerous). Connecting this cable last, and away from the battery, will avoid sparks and potential hazards at the battery.
  9. Make certain everyone is clear of the engine compartments - don't allow hands or clothing to be caught by moving engine parts.
  10. Start the engine of the good car. Allow it to run for 1-2 minutes. Rev the engine slightly by pressing on the gas pedal lightly.
  11. Start the engine of the dead car. It may take more than one try, but do not try to restart it more than three or four times.

Caution: Some car's electrical and computer systems may be damaged by running the engine with a dead battery. Check your owners manual or service provider for guidance.

If the car still won't crank (start):

If the dead car gets no "click" when you turn the key, the booster cables may not have a good connection at the terminals. Turn off the engine and try rocking the cable clamps back and forth to get the clamps to dig into the terminals. Or, try another ground point to attach the negative cables. Retry from step 7. If the engine still won't start, allow the good car to run for 5-10minutes while hooked up to the dead car. Rev the engine slightly. This may build a charge in the dead battery and allow you to restart. If these steps do not work after three or four more tries, stop trying to jump-start. The battery may be shorted internally, or the dead car may have other electrical problems besides the battery. Continuing to try the jump-start can cause damage to the electrical system. Have the car towed to Pep Boys for service.