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Feb 1, 2017

How To Jump Start A Car When The Battery Is Dead

Posted By in Electrical Problems | No Comments »

Most vehicle owners have been there. You leave your car parked in the lot or driveway over night, come out the next morning to drive to work and find you’ve accidentally left the door slightly ajar all night. Not completely open, but just enough to keep the lights on inside of the vehicle and drain the battery. Then comes the jump start. If you’re unfamiliar with the jump starting process and need to know what you’re facing, below is a guide to jump start a car when the battery is dead.

How To Jump Start A Dead Car Battery

Choosing the Right Jumper Cables

Not all jumper cables are created equal. Some are different lengths and different gauges. People are often misled to believe that the longer the cable the better, but this is not the case. Longer cables mean that the energy has to travel further between batteries and can make the attempt to jump start your car, or someone else’s, less effective.

Staying Safe

Make sure that any small children are standing back from the car once you’ve begun the jumpstart process. Once you have connected one side to one battery, those cables—whose job it is to transfer power—are live. Do not touch the other end of the cables together, or have them make contact with anything else. They are to go directly on the corresponding ends of the other car’s battery, that’s it.

Starting the Jump

To start the jump, make sure the two vehicles are facing each other about a foot and a half apart. Automatic cars should be placed in park and manual ones in neutral. Set the parking brakes on both cars so that neither moves during the jump. Both cars Should be turned off with the keys removed. With the cables on the ground and not touching, open the hoods and locate the battery terminals. Attach the positive and negative clamps on one end of the cables to the corresponding positive and negative terminals on the charged battery, then do the same on the other car.

Charging the Battery

Once this has been done, start the car with the working battery. Keep that car running for a couple of minutes to charge the dead battery. You can rev the engine a bit to help with this process. Restart the car with the previously dead battery and then remove the clamps, making sure not to touch them together or to anything. You should take the car for a drive to let the battery recharge more.

Simple as that. As long as you have the jumper cables, and another vehicle to help you out, you should be able to recharge a battery no problem at all.


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