How to Properly Jump Start a Car
How to Jump Start a Car
Whether it's because you left the lights on or your battery is old, most car owners will be faced with a dead battery sooner or later. If you ever find yourself in such a situation, this wikiHow may help you out.
Checking the Battery
Make sure the battery is the problem.
- Check the headlights. Are they dim or bright? (Note that in some cars you will need to turn the ignition on to test the headlights). If they are dim, it's likely your battery is the culprit. If your headlights are bright, you do not have a dead battery and a jump start will not help.
- Ensure that the doors will unlock when you push the button on the key and/or try to open the door from the outside, the interior lights work, and the clock or GPS (if equipped) moves or powers on.
- Put the key in the ignition and see whether your dashboard lights up as usual. Test the stereo. In most cases, even with a low battery you should see some dashboard lights and get some sound out of the stereo. If you do not get a flicker out of your dashboard, you may have a problem with your ignition switch.
- Try to start the car. Does it turn over very slowly, or does it crank quickly? If it cranks quickly, you do not have a dead battery and a jump start will not help. If it cranks slowly, or not at all, you probably have a dead battery.
Jumping the Battery
Open each car's hood and locate the battery.On most cars, it will be near the front of the car on the right or left side, but on some cars the battery is located near the firewall between the engine and passenger compartment. In some cars the battery is located in the trunk. If unsure, check your car manual for location of the battery. Identify the positive and negative terminals.
- The positive terminal will be marked with a plus sign (+) and will usually have a red cable attached on it.
- The negative terminal will be marked with a minus sign (-) and will usually have a black cable attached to it.
Park the working car near, but not touching, the disabled car.Park the car in such a way that the distance between both car batteries is as small as possible. Turn off the engine, radio, lights, A/C, fans and all other electrical components.Make sure that all of these things are off in the disabled car, too. Don't let the cars touch at all.
- If the cars are touching, jumping the battery can cause a dangerous electrical arc between the vehicles.
Put on safety gear (goggles and gloves) if you have it.Inspect batteries for cracks, leaks or other damage. If you find any of these things, do not jump start the car. Call a tow truck instead or replace the battery.
- It may be necessary to remove the disabled automobile's battery cables from the battery terminals and clean both cables and terminals. Use a stiff wire brush to remove all corrosion. Reconnect the cables to the battery terminals and jump the car.
- Remove any positive (+) red post protective covers if applicable.
Untangle and unwind your jumper cables.Like your battery, your jumper cables will probably have red and black cables and will have heavy-duty clamps to connect to the battery terminals. You must make sure that the red and black ends of your jumper cables never touch each other once they are connected to the batteries; permitting them to do so can result in serious arcing and/or damage to one or both cars.
Connect the jumper cables in the order described below:
- Connect one red clamp to the positive (+) terminal of the dead battery.
- Connect the other red clamp to the positive (+) terminal of the good battery.
- Connect one black clamp to the negative (-) terminal of the good battery.
- Connect the other black clamp to a piece of grounded metal on the dead car,preferablythe bolt where the thick negative cable from the battery connects to the chassis. If this is not practical, look for shiny metal (not painted or oily) that is attached to the engine. Usually a nut, bolt or other protruding shiny metal will work. You may see a small spark when you connect to a good ground. As a last resort, you may connect to the negative (-) post of the dead battery, but this risks igniting hydrogen gas coming off the battery.
- Make sure none of the cables are dangling into the engine compartment, where they could be exposed to moving parts.
Start the working car.Let it idle for a few minutes. Do not race the engine, but do rev the engine a little above idle for 30 to 60 seconds. You do this to charge the battery in the dead car, because the starter in the dead car will draw most of the required current (well in excess of 100 amps) from that battery,notthrough the cables. Common retail jumper cables are not built to pass the current required. Charging the dead battery is a must. If 30 seconds doesn't do it, try charging for the full 60 seconds by keeping the engine at a high idle. A good, clean connection between the battery cables and the battery terminals is essential.
Try to start the disabled vehicle.If it does not start, shut the engine off and disconnect the last connection temporarily while youslightly twist or wiggleeach of the four clamps to help ensure a good electrical connection. Restart the working car again. Allow another five minutes for charging before attempting to start the disabled vehicle. If this does not work after a few tries, you may need to have the car towed or the battery replaced.
Remove the jumper cables once the car starts.Do this in thereverseof the order in which they were attached, and don't let any of the cables or clamps touch each other (or dangle into the engine compartment).
- Disconnect the black clamp from grounded metal on the dead car.
- Disconnect the black clamp from the negative (-) terminal of the good battery.
- Disconnect the red clamp from the positive (+) terminal of the good battery.
- Disconnect the red clamp from the positive (+) terminal of the dead battery.
- Replace any positive (+) red post protective covers if applicable. These covers help prevent accidental short circuiting the battery.
Keep the recently-disabled car's engine running.Run the car above idle (slightly revved up with your foot on the gas) for five minutes and then on or above idle for 20 minutes before turning it off. This should give the battery enough charge to start the car again. If it does not, you probably have a dead battery or a dying alternator.
Without Cables (Manual Transmission only)
Position the car at the top of a hill, or have people push the car.
Depress the clutch completely.
Put the car in second gear.
Turn on the ignition but don't start the engine.This is also known as key position two. The key is inserted and turned one step to the right. Turning one step further would start the engine, which you don't want to do.
Let go of the brakes.Keep the clutch depressed. You'll start coasting down the hill or moving due to people pushing.
Let go of the clutch quickly when the speed reaches 5 mph (8.0 km/h).The engine should turn and start. If it doesn't, try depressing and releasing the clutch again.
QuestionCan one person alone jump start a car?wikiHow ContributorCommunity AnswerSure, as long as you have two cars and a jumper cable.Thanks!
QuestionDo I need to run the car for 15 minutes after a jump start?wikiHow ContributorCommunity AnswerYou should run your vehicle for 15 to 30 minutes after a jump start to allow your alternator to charge the battery. If you don't, you risk the battery not having enough power to start the vehicle on its own.Thanks!
QuestionShould you turn the key as you let the clutch out in the last step?wikiHow ContributorCommunity AnswerYou don't need to turn the key even further because in the last step you are basically doing what the car would do normally after turning the key. Instead of the starter getting your engine moving, you are getting the engine to move by letting go of the clutch while it is moving.Thanks!
QuestionWhat does it mean if the car won't hold a jump and no charge light stays on?wikiHow ContributorCommunity AnswerYou have a bad battery. Once you jump, drive to the nearest place that sells good batteries and get it replaced. If you still have the problem with the good battery, you have some sort of electrical problem and need to get it repaired.Thanks!
QuestionIs it safe to start the car engine with the 6V car battery charger still connected to the 6V battery in my automatic car?Community AnswerThis is not a good idea. You should disconnect the battery charger before attempting to start the car. It's not contributing to the start process in any way.Thanks!
QuestionHow do I jump start when one of the cars battery negative terminal is inaccessible?wikiHow ContributorCommunity AnswerIf battery terminals of both cars are inaccessible, then you can do this: 1 turn on the engine of the car with good battery, 2. remove both batteries from both cars, 3 then connect the good battery to the car with bad battery and try to turn on the engine. Bear in mind to keep the engine of the car with the good battery turned on until the next car is turned on, the reason is that you can decrease the level of the good battery if your car can't jump start.Thanks!
QuestionDoes it actually matter which gear I put the MT car in?wikiHow ContributorCommunity AnswerYes. Ideally you should try in 2nd Gear and press clutch as soon as the car starts and revvs up.Thanks!
QuestionCan I use a 12 volt battery to jump a 6 volt battery?wikiHow ContributorCommunity AnswerNo, you cannot. The voltages of both batteries must match, or you risk doing serious damage to both batteries. The amperage does not have to match, however; in fact, it's preferable to have the "good" battery be of higher amperage than the "bad" battery.Thanks!
QuestionWhat happens if you put the cables on the wrong terminals when jump-starting a car?wikiHow ContributorCommunity AnswerYou risk not only damaging both batteries, but you could also try other essential electrical components.Thanks!
QuestionThe post on the positive is sheared off and the clamp won't stay on. What can I do?wikiHow ContributorCommunity AnswerYou can try to connect your jumper cable to the positive cable running from the battery to the starter. If this is not possible, try smaller clamps, or just simply hold the clamp in contact with the positive terminal. This last solution requires the help of a second person, and is only advisable as a last resort.Thanks!
How do I rewire my starter with the 4 pin relay to and ignition coil?
How do I jump start a car battery with a 3-in-1 power system?
Short Video: How to Jump Start a Car
1. Open the hoods on both cars, find the batteries, and get out the jumper cables.
2. Connect the red clamps to both batteries' positive terminals.
3. Connect one black clamp to the good battery's negative terminal.
4. Connect the other clamp to some grounded metal on the dead car.
5. Start the working car, then the dead car.
6. Remove the cables once the dead car starts.
- Do not connect the black leads first and the red leads after. If you do that and accidentally drop the red cable onto the car's frame, a massive short-circuit will form, possibly welding the clamp to the chassis.
- Don't let the working vehicle leave for at least ten minutes. The dead battery must charge for a while, and sometimes will go dead again (especially if you do not keep the engine above idle).
- Remember that batteries are not always in the same place. Some vehicles have the battery under the hood, some behind the cab, and some are even in the trunk.
- Many jumper cables have instructions with pictures explaining the order to attach the clamps.
- Buy only high-quality, heavy-duty jumper cables. This is determined by the wire thickness gauge. The lower the gauge number, the heavier the conductor (a #10 conductor or wire is a smaller or thinner than a #8 wire). Do not judge the cable by the overall thickness of the cables alone, as many manufacturers disguise cheap cables simply by encasing a thin conductor with a generous layer of inexpensive plastic insulation. Also remember that the longer the cable, the thicker the wire needs to be.
- There is no electrocution hazard performing a jump on most cars and light trucks. The voltage in the case of jumping is about 12. 12 volts hasn't fatally electrocuted anyone, however just a small spark near a battery has caused explosions that have caused serious injury or burns. A spark caused by an accidental short circuit is large due to the amount of current or amps,notthe voltage.
- The push/hill start method also works with the car in reverse. Reverse can be easier and requires lower speeds due to the gearing. This also provides an alternative if your car is parked on a hill facing up and you cannot push the car up. You cannot push-start an automatic transmission equipped car, unless you are capable of getting to speeds above 40 mph (64 km/h), which isn't recommended since you will not have power brakes or power steering.
- Extinguish open flames and smoking materials when near batteries. Batteries emit hydrogen gas as a normal by-product of the chemical process to generate electricity. Hydrogen gas is highly explosive.
- Consider purchasing an alternator should you leave your car parked and unused for extended periods of time. They can be found at stores that sell car accessories, and plug into an AC outlet to keep the battery charged enough to start the car.
- Jumping a dead car battery does not require “charging” from the good car battery. This is a common misconception. When jumper cables are attached, you are merely starting the dead car using the good car battery - that’s it. No charge time necessary.
- Keep your face as far away from the batteries as you can at all times.
- A charging or discharging battery creates hydrogen gas, which under certain circumstances can cause the battery to explode.This is why you should try to avoid connecting two batteries directly to one another (all four clamps on battery posts). Use this as a last resort when the primary method fails and you have taken proper safety precautions. Make sure you stand clear. There may be sparks which can cause an explosion.
- Never cross the cables while attached to a car battery.
Sources and Citations
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