Omari Gates
Knowing how to jump-start a car is an essential skill that can save you time, money, and stress. A flat battery is usually the culprit when a car won't start, and this can be caused by a number of things, such as cold weather, accidentally leaving your lights on, or an old battery. Jump-starting a car is generally safe if done correctly, but precautions must be taken to avoid injury or damage to your vehicle. This guide will walk you through the steps to safely and effectively jump-start your vehicle and get back on the road in no time.
| Characteristics | Values |
|---|---|
| Flat battery causes | Leaving car lights on, radio, headlights, cold weather, old battery |
| Flat battery signs | No cranking sound from starter motor, struggling to turn the engine |
| Equipment | Jumper cables, another vehicle with the same voltage, car manual |
| Precautions | Check for damage, turn off electrical components, park on a flat surface, use correct jumper leads |
| Jumpstart steps | Connect positive jumper lead to positive terminal on flat battery, connect other end to positive terminal on donor battery, connect black jumper lead to negative terminal on donor battery, connect other end of black lead to unpainted metal surface under bonnet of car with flat battery, start engine |
| Post-jumpstart | Keep car running or drive for at least 30 minutes, do not turn off engine |
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What You'll Learn
Check if your battery is flat
Before attempting to jump-start your car, it is important to determine that your battery is flat. The most obvious way to do this is to turn the key in the ignition and listen for the usual cranking sound from your car's starter motor. If it sounds like it is struggling to turn the engine or does nothing at all, you may have a flat battery.
Other signs that your battery is flat include accidentally leaving your lights, radio, or another power-draining feature on for a long period without running the engine. Cold weather, an old battery, or not starting your car for a long period can also cause a flat battery.
If your car has a smart system, it may automatically turn off your headlights, but this does not mean you cannot flatten your battery. Something as simple as leaving the interior light on or running the stereo while washing your car can drain the battery.
If your car battery is completely dead or damaged, jump-starting will not work, and you will need to replace the battery. If jump-starting fails, this could also indicate another electrical or mechanical problem, such as an issue with your starter or alternator.
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Identify the positive and negative terminals
When jump-starting a car, it is crucial to correctly identify the positive and negative terminals on both the dead battery and the donor battery. This is essential for safe maintenance and troubleshooting. Misidentifying or incorrectly connecting the terminals can lead to serious damage or even cause an explosion.
The positive terminal is part of your car's electrical circuit and provides the source of power. It is typically marked with a "+" symbol or a red colour-coding. The red cable is the positive cable and should be connected to the positive terminal on both the dead and donor batteries. If your jumper cables are not colour-coded, look for a plus sign (+) to identify the positive cable.
The negative terminal completes the electrical circuit. It is typically marked with a "-" symbol or a black colour-coding. The black cable is the negative cable. However, do not attach the negative cable to the negative terminal of the dead battery. Instead, attach it to an unpainted metal surface, such as a bolt, on the car with the dead battery. This helps to safely disperse the charge and reduces the risk of sparks igniting any hydrogen gas emitted by the battery.
Some vehicles feature a dedicated "ground" post under the hood, specifically designed for jump-starting. If your vehicle has one, always use this post for the final negative connection. It is typically located away from the battery to provide a safe, spark-free grounding point.
It is important to remember the correct order when connecting the jumper cables. Always connect the positive terminals first, followed by the negative terminals. This reduces the risk of sparks and battery damage.
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Connect the red jumper lead to the correct terminals
When jumpstarting a car, it is important to connect the red jumper lead to the correct terminals to avoid any damage to either of the cars. The red jumper cable represents the positive cable, so it should be connected to the positive terminals of both the dead battery and the donor battery.
First, locate the positive terminal on the dead battery. It is usually situated in the engine bay under the bonnet but may be in the boot in some vehicles. It will be marked with a '+' or 'POS' sign. Once located, connect the red clip to the positive terminal. Ensure that the lead does not touch any vehicle metal.
Next, connect the other end of the red jumper lead to the positive terminal on the donor vehicle's working battery. This terminal will also be marked with a '+' or 'POS' sign.
It is important to note that you should never connect the black cable to the negative terminal on the old battery as this may cause a dangerous spark or explosion. Instead, connect the black cable to a good earth point, which is usually a solid metal component of the engine, such as a bolt or bracket.
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Connect the black jumper lead to the correct terminals
Now that you've connected the red jumper lead, it's time to connect the black one. The black jumper lead is the negative cable. It is very important that you connect the black jumper lead to the correct terminals, as incorrect connections could cause a dangerous spark, or even an explosion.
First, connect one end of the black jumper lead to the negative terminal (-) of the charged battery. Do not connect the black cable to the negative terminal on the discharged battery.
Next, connect the other end of the black jumper lead to a good earth point on the disabled vehicle. A good earth point is a solid metal component of the engine. The engine block is typically the best place for a good earth. You can also connect the other end of the black jumper lead to a large, unpainted, metallic part of the car's engine, away from the battery.
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Take a 30-minute drive to recharge the battery
After jump-starting your car, it is recommended that you drive for at least 30 minutes, ideally at highway speeds, to allow the alternator to begin recharging the battery. However, it is important to note that a 30-minute drive may not fully recharge a dead or low battery, as this advice stems from older vehicles that had fewer electrical demands.
The time it takes to recharge a car battery depends on several factors, including the state of the battery, weather conditions, and the vehicle's electrical demands. If your battery is only slightly drained, a 30-minute highway drive might give it a decent recharge. However, if it is more seriously discharged, you may need several hours of continuous driving to get close to a full charge.
It is worth noting that driving is not the only way to recharge a car battery. Charging the battery with a mobile or plug-in charger is another effective method. Plug-in battery chargers typically take 10-24 hours to fully charge a car battery. Charging slowly is recommended to protect the battery and avoid overheating. Regular battery terminal cleaning can also help maintain battery health and extend its lifespan.
Additionally, if your battery is frequently discharging, it is advisable to check for other problems, such as a faulty starter or alternator, and address them accordingly. Car batteries typically last three to six years, depending on proper maintenance and care.
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Frequently asked questions
A flat car battery is usually indicated by a struggling starter motor or a clicking noise when you turn the key in the ignition.
Car lights, the radio, or other power-draining features being left on without the engine running can drain the battery. Cold weather and old batteries can also be factors.
You will need a working donor battery from another vehicle with the same or higher voltage, jumper leads (with a surge protector), and your car manual.
Park both cars on a flat surface, facing each other, close enough for the jumper leads to reach but not touching. Turn off all electrical components and the ignition in both cars, and engage the handbrakes. Check the batteries and jumper leads for damage, and do not let the clamps touch each other while connected.
Connect the red/positive lead to the positive terminal of the flat battery, then to the positive terminal of the donor battery. Connect one end of the black/negative lead to the negative terminal of the donor battery, and the other end to an unpainted metal surface under the bonnet of the car with the flat battery.
