How to Jump Start a Car





Introduction: How to Jump Start a Car

In this instructable I will show you the basics of jump starting a car.

Step 1: Getting Ready

First off make sure you have everthing.
1. Jumper cables
2. A car with a good battery
3. A car with a dead battery

Park the good car so that the batteries are close enough to connect each other with the jumper cables.(duh)
Then pop the hoods and find the batteries.

Step 2: Connecting Step 1

Now to connect the cables.

First, connect one of the positive (red) of the jumper cables to the dead car battery (+ or red) There might be a plastic cap to pop off too.

Step 3: Connecting Step 2

Connect the positive (red) cable to the good battery. There might be a plastic cap on this one too.

Step 4: Connecting Step 3

Connect the negitive cable (black) to the negitive post (- or black) on the good battery.

Step 5: Connecting Step 4

Now connect the last negitive cable to a shiny part on the engine or directly connected to the engine by a big chunk of metal. A nut will work nicely as long as its not painted oily or really dirty. A spark is normal when connecting this last cable.

Step 6: Starting

Start the car with the good battery and let it run a few mins to charge the dead battery. Now before trying to start the dead car it is recommended to shut off the good car. But in my experience most of the time you need the extra juice of the alternator. So I myself almost allways leave the car running and I have not had any problems.
Anyways all thats left is to try and start the dead car. And once started disconect the cables th opposite way you put them on. The battery on the dead car will not have much of a charge so you should put a battery charger on it as soon as you can. I hope this has been some help and good luck.



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car battery are an issue when it is about to replace a battery. Must concentrate on the quality of the battery, Click on car battery and get satisfied with the durability and quality.

I found some other important tips on boosting the battery

"Now before trying to start the dead car it is recommended to shut off the good car. The sudden power strain can kill the diodes in the alternator." There is no danger to the alternator diodes of the donor car being in danger of a "sudden power strain". There is a voltage drop through the cables. The voltage of a running car is higher than battery voltage. So if you leave the engine running, you are starting at about 1.2-2V higher, which will help overcome the voltage drop in the cables. If you shut the car off, you are significantly reducing the chances of the engine with the low battery starting. Ruining alternators from properly jump starting cars is the stuff of urban legends.

I talked to some ppl about this and your right. Thank you for letting me know

we actually rev the motor a little whenever the car with the dead battery still has a hard time starting

Might want to add that after jumping, the dead car should be driven for about 20 minutes to recharge the battery fully, otherwise you end up with a dead car again.

20 minutes will not be long enough to fully charge a battery that was weak enough where it couldn't start the car. Will it be enough to start it again later? Possibly. But after a jump start, the battery should be fully charged with a battery charger to ensure a long battery life. An alternator is a trickle charger and is not a substitute for a battery charger. By not fully charging your battery, your battery will constantly be in a semi-charged state and will not live out a normal life expectancy.

car battery chargers are mostly always trickle chargers... It means you need to take the battery out (I might be wrong (Im 14)) The charge it then put it bake in when you wanna go out some where

You can connect a trickle charger to the batter while it's still in the car ;) Just don't start the car with it connected.... Perhaps it was me using a very old charger, but it no longer worked after that :p Some of the more hard core mileage guys will do just that... I know of some people that run without an alternator for short trips, and recharge their battery on a solar collector ;)

So now, why the hell would you run your vehicle without an alternator??? (This is assuming it had a perfectly fine one in the first place).