How to Jump Start a Car When Battery is Dead
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The document provides instructions for jump starting a car with a dead battery. It begins by explaining battery basics, such as the battery providing electrical power to start the car and signs of a failing battery. It then outlines the steps to jump start a car, which are to connect the positive clamps of the jumper cables to each battery first, then connect the negative clamps - with the black clamp attached to a metal part of the dead car's engine. Finally, start the working car and let it run for 30 seconds before attempting to start the dead car.
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How to Jump Start a Car When Battery is Dead
- 1. How to Jump-Start a Car By: Afshan Ahmed SEO Executive SBT JAPAN
- 3. Battery Basics I The battery provides electrical power to help start the car A battery is good for about 4-5 years After that you are risking trouble Green ball indicator Rough indicator that the battery is OK 12.2-12.6 volts is the good range for most batteries Below 12 volts is probably trouble
- 4. Battery Basics II The battery has a positive and a negative terminal The positive terminal = red cable = “+” sign The negative terminal = black cable = “-” sign Battery cables should be connected firmly to the terminals Terminals and battery clamps should be relatively clean Batteries can be dangerous
- 7. Before You Begin Be sure to have jumper cables! Bring “jumper” car close to the car with the dead battery Cars should not be touching! The jumper cables should be relatively clean Turn off cars and all accessories on both cars If you can, measure the battery voltage
- 8. Park working car in front of dead battery car
- 9. Turn off functional car battery.
- 10. Think Positively First identify the positive post on each battery The positive post usually has a “+” sign on it (or red cable) The safest battery is the dead battery So start there Put the red clamp on the + post of the dead battery Then put red clamp at the other end on the + post of the good battery
- 11. Note terminals positions (Positive and Negative)
- 12. Connect both ends of jumper cables on the same signs of both batteries
- 13. Halfway there! + is done While you are at the good battery, attach the black clamp to the negative (-) post Attach black clamp at the other end to a solid metal part of the dead car’s engine away from the battery Start the good car!
- 14. Solid metal part of the dead car’s engine
- 15. Start charged battery’s car engine.
- 16. Finishing up! Rev up the “jumper” car a little bit (to get the alternator running) Let the car fast idle for about 30 seconds or so If the battery is super dead it needs a little extra charge Start the dead car! Reverse the process to release the clamps (-D → -G → +G → +D)
- 17. Things to Watch For Battery voltage is below 9.5 volts or no green ball Might be better to charge it separately High-voltage starting kits may cause the voltage to go above 17 volts which can damage electronics/computers in car Find out why the battery died Lights Wiring, loose fan belt, diode in the alternator, bad grounds, bad battery cable connection…
Editor's Notes
- Nothing’s more frustrating than a dead battery. In this 10 minute presentation I’d like to give you the basics of how to jump-start a car. Let’s begin by understanding something about the battery itself.
- The battery is responsible for supplying electricity to the starting motor which cranks the engine. The battery also supplies the electricity to the distributor which forwards the electricity to the right spark plug at the right time. The spark then ignites the fuel. Two things that you can check to determine if you battery is good are the green ball indicator and the voltage range. Sometimes a battery has a little green ball that floats in a window on the top of the battery The little green ball indicator is based on the specific gravity of the fluid in the battery relative to the ball. Changes in the electrical property of the battery acid cause the ball to rise or fall. Measuring the voltage requires a volt meter. Just for your general information, a voltmeter is a device that allows you to tap into the positive and negative terminals of the battery and read the charge.
- I’m sure all of you have seen a car battery at some point in your life. For our purposes, we are most concerned with identifying the positive and negative terminals on top of the battery. These will feature prominently in jump-starting the car. <picture of battery with positive and negative terminals identified> As general maintenance, with the car off, make sure the battery cables are fastened tightly to the battery. Use a rag to clean the terminals and connectors (maybe spray cleaner too). Clean the terminals one at a time but be sure not to touch both since this will create a large spark. When jump-starting a car, you must remember that batteries can be dangerous. First, they can deliver a severe shock if jumper cables are not connected correctly. Secondly, if a spark occurs near the battery, it can explode, spewing acid
- Measuring the battery voltage is a little bit off the beaten path. But if you are near a garage or have some way of measuring the voltage you can tell whether it might be a good idea to try to jump-start the car. If the voltage of the battery is below 9.5 volts, then jump-starting the car might cause problems with the electronics of both cars. In this case, you need to remove the dead battery and use some external charger to bring it back up to 12 ½ volts. Just something to keep in mind.
- Now let’s get back to jump-starting the car. The posts may have to be cleaned (wipe it with a rag) to make it readable and to get a good connection, but DON’T touch both posts at the same time. If you connect to the wrong signs, then you will get a big spark and probably cause problems to both cars Remember, ‘positive to positive’ is the way to go.
- Watch out for the fan so that it does not hit the cable when you attach to the negative terminal Never make a final connection directly to the dead battery only to metal on the car.
- Why does the alternator need to run? What is the purpose of the alternator? At no time should any of the clamps touch each other. If they touch then you are in the circuit.
- Lights are the culprits most of the time There are several diodes in the alternator of your car and if one of them goes bad then not all of the electricity generator by the alternator goes into the car and causes a large drain on the battery The same thing with bad grounds or wires or Bad grounds can also cause the sensors in your car to report incorrect values Sometimes when you rev the engine the lights will be brighter (one indicator of bad electrical problems)