How To Jump Start Your Car If The Battery Is Flat
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How To Jump Start Your Car If The Battery Is Flat
This is an easy and efficient way to get you back on the road if your car doesn't start due to a flat battery. Watch VideoJug's guide on how to jump start a car, saving you waiting to be rescued.
Step 1: Secure the vehicle
Carry out the jump-start away from traffic if you can and park
on a level surface if possible. Apply the parking brake and shift into first gear.
In automatic cars move the gear stick to the parking position.
SAFETY WARNING ! Do not smoke whilst carrying out these steps.
Step 2: Open the bonnet
Release the bonnet using the lever in the car's interior and
move the bonnet-catch for final release.
Lift the bonnet and locate the prop rod.
Now, secure the bonnet with the rod.
Step 3: Locate the battery
In most cars, it is usually under the bonnet. In others, the battery is under the seat or in a compartment in the back of the car.
Make sure to have easy access to your battery and its terminals.
On most batteries you have to remove the terminal covers in order to attach the jump leads..
Consult your manual If in doubt about your battery's location.
Also determine your battery's voltage.
With the exception of some new models, most cars allow for jump-starts.
Step 4: Check the state of your battery
you may have just left the lights on; in this case your battery should be back on if you follow all the steps.
There may be, however, more serious reasons for a discharged battery that cannot be solved with a jump-start.
Excessive amounts of solidified, corroded battery acid may be an indicator of severe damage. SAFETY WARNING ! Stop if your battery is cracked, corroded or leaking. A jump-start will not work in this case and there is a danger of explosion
SAFETY WARNING ! Stop if your battery is cracked, corroded or leaking. A jump-start will not work in this case and there is a danger of explosion.
Step 5: Line up both vehicles safely
The batteries should be as close to each other as possible.
However, have a safety gap between the cars as vehicles should never be touching.
Secure the second vehicle.
Turn the ignition off.
Apply the parking brake.
Shift into first gear.
If the vehicle is automatic place the gear stick in the P position.
Step 6: Turn off all electrical devices.
Turn off the lights, indicators and finally the radio.
Accidentally left on devices may get damaged by the high and sudden voltage.
Step 7: Open and secure bonnet
Open and secure the bonnet of the vehicle that is providing the jump start. Do this as made clear in step 2
Step 8: Identify the terminals on the fully charged battery.
Usually the positive terminal (plus) has a red cable, the negative (minus) a black one.
Step 9: Identify the terminals on the flat battery.
The negative terminal has a plain black cable, the positive terminal has a red cable
Step 10: Clean all the terminals
Clean all terminals with wire brush
Step 11: Connect the flat battery
Attach a red clip to the positive terminal of the flat battery.
Step 12: Connect the charged battery
Connect the red clip to the positive terminal of the charged battery.
Step 13: Connect the negative on the fully charged battery
Attach the black clip to the negative terminal on the battery that is fully charged.
Step 14: Connect the earth
To earth the flat battery attach the black clip to any metal part on the actual engine itself.
Make sure the metal part is unpainted and free of grease to guarantee a proper flow of electricity.
Connect to a bolt or a nut, they are typically good contact points. This significantly reduces the danger of explosion from batteries.
Step 15: Start car with fully charged battery
Get ready to start the car with the fully charged battery.
Turn on the ignition,
shift into neutral
start the engine and step on the accelerator.
Make sure any bystanders are at a safe distance from the open bonnets
Step 16: Leave the engine running for 5 minutes
Leave the engine running for about five minutes. Step on the accelerator as this will provide your battery with the necessary charge.
Step 17: Start the car with the flat battery.
Get ready to start the car with the flat battery.
shift into neutral
turn on ignition
start engine
Done! Step on the accelerator for further charge.
If this did not work leave the engine running for 5 minutes and try again.
Step 18: Disconnect the jump-leads
Disconnect the black clip from the engine block.
Disconnect the other black clip from the negative terminal of the battery providing the jump-start.
On the same battery disconnect the red clip from the positive terminal; and finally disconnect the other red clip from the positive terminal to disconnect fully.
Step 19: Close the bonnet
Close the bonnet. Make sure it is properly shut;
and of course, don't forget to thank the friendly driver.
Now that you know how to do it, the next time it'll be you providing a jump-start.
Tips & Comments
NO,NO,NO! Absolutely do NOT end up with both engines running at the same time. In other words: By all means run the slave vehicle, connected to the flat vehicle for 5 mins to put a surface charge on the flat battery BUT: Switch off the slave vehicle before trying to start the flat vehicle. Because the two vehicles are connect together you effectively have one electrical circuit. You must not run two alternators on the same circuit. If you do you run a very real risk of damaging one or both of the alternators on either car. There is also a risk on later cars of damaging the on board management system (the computers). A good set of leads (not cheap thin ones) and a good slave battery will start the dead vehicle without the need to run the engine. I know this as I repair cars for a living and used to rebuild alternators.
No good deed goes unpunished. Although it is an easy process, it can cause the host car the cost of an alternator if not done properly. If the guest battery is dead as in shorted cells, then it presents low resistance to the host system. If you start the host system and run it for a few minutes, your generator will produce maximum current due to low resistance of the guest battery. The alternator diodes can crack and thus leak current in the host alternator car. is parked for a few days the host battery will discharge. Now the host can get a boost and it will be fine for the next time the car is parked for a few days. If the car is used every day, then the alternator will charge the battery. It is the reverse diodes that once crack will leak the current through the alternator to ground. If it happens again, the host car will think that has a bad battery and replace it. It will be fine until the car is once again rested for two or more days. After a while, a mechanic will tell you that you need an alternator and the price is $400 or so. You will not connect the dots that it was from that day you did a friend a favor. I say give the jump but don't run your engine. If he can't take it from your good battery, then there must be something else wrong. Again, don't run the engine especially if you don't know the status of the guest battery.
Very thorough - I didn't know it was such a complicated process. Just to clarify, you should connect positive to positive first, then negative to negative, is that right? And to clarify, it is called a bonnet in British English. I know Americans call it a hood, but I don't call you stupid for doing it; so don't say we are "stupid people" for calling it something else. :-p Since the video is narrated in British English, you might expect it to use British terminology - I am sure that you are intelligent enough to translate it yourself, and there's no need to make a big fuss over such a trivial point.
don't put it in 1st!
I was so pleased to see this as I was in a state of panic having left a light on in my son's car that had drained the battery. I have never in my life had to jump start a battery before, but step by step followed the video and it worked first time! You have managed to enable me to rescue a very embarrasing situation. Thank you so much for the very easy to follow instructions.
informative & very clear to understand -Mari
wow ...made so waey
Very helpful site...my husband is away on a military deployment and my car battery went dead, the information here helped me a lot....thank you very much
But when do you turn off the ignitions of both cars? This is not made clear ?
So why shift into first when connecting the jump leads and then back into neutral, surely the handbrake will hold the car ?