Use cables that are free of corrosion and ones that can connect securely to the battery. Take extreme caution when working around a battery as it has the potential to produce explosive gases.Don’t let the cables touch each other as this can seriously damage the car computer and it’s charging system.You want cables with well-insulated lamps and at least 8-gauge wire. If you’re looking to purchase jumper cables, buy ones that are the best quality you can afford.If the terminals on either battery are corroded, wipe them clean (while wearing gloves to protect your hands) to ensure that the clamps can make a solid connection. If the battery is in this type of condition, it’s likely time for a replacement. If the battery in the dead car is cracked or leaking, do not try to jump the vehicle as doing so could cause an explosion.Drive the car that was just jumped to a safe place before you turn off the engine.ĭepending on the condition of the battery (new versus old), it could require another boost to get the juices properly flowing, so keep in mind when you shut it off that there is a chance you’ll have to repeat the boost process to get it back on again.The final step is to disconnect the other end of the positive cable (red) from the positive post (marked with a “+” sign) of the formerly dead battery.Remove the positive cable (typically red) from the positive terminal (marked with a “+” sign) of the booster car battery.Then unhook the other end of the negative cable (black) from the negative post (marked with a “–“ sign) of the booster car battery.Disconnect the negative cable (typically black) from the engine block or unpainted surface of the car that was jump started – this will break the circuit.Once the dead vehicle has been boosted, remove the jumper cables in the reverse order.Īgain, watch that you don’t let the cables fall into the engine or allow the cable ends to touch each other.At this point, you might want to consider other factors as to why the vehicle won’t start. If the dead vehicle doesn’t start, don’t persist or you could damage the starter. Start the dead car and let both vehicles idle.If the battery is new and drained due to lights or accessories left on, then the battery won’t need a lot of idling time. If it’s an old battery that’s been dead for longer than a month, then the boost process could take a while. The length of idle time depends on how dead the battery is. Start the booster car and let the booster car idle for several minutes.Visually check that jumper cables are connected securely to the battery.Īlso, double check that the cables aren’t dangling near any moving engine parts in either vehicle.Safety Tip: You want to make sure that the last jumper connection made is the dead battery, not the live battery on the booster car. Doing this provides a solid ground and reduces the possibility of igniting the hydrogen gas emitted by the car battery. This could be an unpainted bolt or bracket that is as far from the dead battery as possible. Connect the other end of the negative cable.īe sure that it’s attached to an unpainted metal surface on the engine of the dead car.This is normally marked with a “–“ sign on the booster car. Attach the negative end of the cable (typically black) to the negative battery terminal.Attach the other red clip to the positive terminal of the other car. Generally, the battery’s positive terminal is larger than the negative one and could have a cover on it. Connect the positive end (typically red) of one of the jumper cables to the positive terminal on the dead battery (labeled with a “+” sign).Check to make sure the jumper cables you’re using are well insulated and clean.Īs you prepare to connect the cables, you may want to consider wearing protective eye equipment as well as safety gloves.Unplug anything that’s hooked up to the cigarette lighter that might be plugged into your car, like a USB charger. You want them close enough so that the jumper cables will reach, but not so close that they touch.īe sure both cars are in park (or in neutral if they have a manual transmission), put on the parking brakes and double check that all the car accessories are turned off. Pull the booster vehicle so it’s close to car with the dead battery.The next time you come across a battery that just won’t start, here’s a guide you can follow to safely boost a car using jumper cables. Chances are, at some point in your life you’ll encounter a flat tire (see our article on how to change a flat tire) or a dead battery, either with your car or with the vehicle of a friend or family member.
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