How to Jumpstart a Car Without Blowing Anything Up
There is a very specific sinking feeling you get when you turn the key in your car ignition and instead of the engine roaring to life, you hear a rapid, pathetic clicking sound. Your battery is dead. Maybe you left the interior light on, or maybe it’s just the first freezing morning of winter. Whatever the reason, you are now stranded. Jumpstarting a car is a fundamental life skill that everyone should know, but many people are terrified of doing it wrong and causing an electrical short. Modern cars make this safe, provided you follow the right order and treat the equipment with respect.
Position the cars correctly
First, you need a 'donor' car with a working battery. Park the working car facing the dead car, or park them side-by-side, so their engines are as close as possible. Make absolutely sure the two vehicles are not physically touching each other. Put both cars in Park (or Neutral if it's a manual), engage the parking brakes, and turn the engines completely OFF. Take the keys out of the ignitions to be absolutely safe.
Identify the positive and negative terminals
Pop the hoods of both cars and locate the batteries. Every car battery has two metal terminals sticking out of it. One will have a plus sign (+) and is usually covered by a red plastic cap. This is the Positive terminal. The other will have a minus sign (-) and is the Negative terminal. If you cannot clearly see the plus or minus signs, stop. Do not guess. Wipe away any grime until you can clearly see the markings.
Connect the cables in the exact right order
This is the most critical step. Memorize this sequence. First, clamp a RED cable to the positive (+) terminal of the DEAD battery. Second, clamp the other end of the RED cable to the positive (+) terminal of the GOOD battery. Third, clamp a BLACK cable to the negative (-) terminal of the GOOD battery. Finally, clamp the other end of the BLACK cable to a piece of unpainted metal inside the engine bay of the DEAD car (like a shiny bolt on the engine block itself). Do NOT clamp this last black cable to the dead battery's negative terminal; doing so can create a spark directly over the battery, which is dangerous.
1. RED to DEAD (+)
2. RED to GOOD (+)
3. BLACK to GOOD (-)
4. BLACK to METAL on the dead car (Ground)
Start the donor car and wait
Start the engine of the working car. Let it run for about three to five minutes. This allows the alternator in the good car to actively push a charge into the dead battery. You can even rev the engine of the good car slightly (pressing the gas pedal a tiny bit) to speed up the charging process. Do not try to start the dead car immediately; it needs a minute to soak up some juice.
Start the dead car and disconnect in reverse
Now, try to start the dead car. If it starts, wonderful! Leave it running. If it just clicks, wait five more minutes and try again. Once the dead car is running smoothly, you must disconnect the cables in the exact REVERSE order of how you put them on. Remove the black cable from the metal ground, then the black cable from the good car, then the red cable from the good car, and finally the red cable from the previously dead car. Keep the newly revived car running for at least twenty minutes so its own alternator can fully recharge the battery.
Citations & External Resources
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Frequently Asked Questions
How to Jumpstart a Car Without Blowing Anything Up?
Staring at a tangle of jumper cables on the side of the road is intimidating. Knowing the proper sequence ensures you can safely revive a dead battery... For more practical tips, check out our guide on How to Check Your Car's Oil (Without Looking Like an Idiot).
What is the best way to jumpstart a car without blowing anything up?
The best way to jumpstart a car without blowing anything up is to follow a systematic step-by-step approach. There is a very specific sinking feeling you get when you turn the key in your car ignition and instead of the engine roaring to life, you hear a rapid, pathetic clicking sound. Your battery is dead.... You might also find our guide on How to Check Your Car's Oil (Without Looking Like an Idiot) helpful.
How long does it take to jumpstart a car without blowing anything up?
Most people can jumpstart a car without blowing anything up within a few weeks minutes of consistent practice. The exact timeline depends on your starting point and how diligently you follow the steps in this guide. For more help, read our related guide: How to Check Your Car's Oil (Without Looking Like an Idiot).