![]() This happens when the casing of the battery cracks a bit because of the pressure of the hydrogen gas. If you have lead-acid batteries, which are the most common type of car batteries, hydrogen gas could be discharged. The result of these two batteries connecting the wrong way could melt/damage either battery. In this case, I am referring not only to the dead battery that is being jump-started but also to the battery from the rescue car as well. The result of incorrectly connected batteries is that heat is created, gases are generated, and dangerous situations can occur. But, if the connection persists for a while, the electrical current doesn’t have anywhere to go, and damage to the battery is likely to occur. If a battery was connected the wrong way momentarily during a jump start, there would likely be a small amount of damage. The good news is that they can be replaced, and no permanent damage is done. The electrical system may be damaged, including sensors and fuses. Switching the color, putting the red cable on the black (negative) battery terminal and the black cable on the red (positive) terminal, can send power where it’s not supposed to go. Jumpstarting the car the wrong way will cause less damage when the cars are off. That’s why the 1st step to jump-starting is to turn off both cars and remove the keys. ![]() Some cars have spare fuses, so checking your owner’s manual might be helpful.ĭamage to the electronic could be worse if more power was added. Luckily nothing else seemed to be damaged. In the short video above, damage occurred to the fuse. The car may sustain some damage, but nothing serious usually occurs that would lead to serious harm. If an accident does occur, most of the time, you don’t need to be concerned for your safety. Go on a quick drive or let it idle for at least 20 minutes to build up the charge.Jump Starting the Wrong Way: The ConsequencesĮach car is a little different, but each has fuses that help protect the car.Once the dead car comes alive, disconnect the jumper cables in the reverse order (first the black, negative clamps followed by the red, positive clamps) while making sure that the clamps do not touch each other.Start the engine on the functional car to begin charging the dead car battery through the jumper cables, and let it do so for a few seconds.Connect one end of the other jumper cable (black, negative clamp) to the negative end of the booster battery, then the other end (partnering black, negative clamp) to a solid, stationary, metallic point away from the battery.Connect the other end (red, positive clamp) to the positive end of the booster battery.Connect one end of a jumper cable (red, positive clamp) to the positive end of the discharged battery.Open the positive terminal cap inside the engine room fuse box and the negative terminal cap close to the vehicle body. Some may even be in the boot or under the seats. *Accessibility of your battery depends on the make and model of your car. ![]() Open the engine hood and remove the service cover on the front passenger seat side in the engine compartment. ![]() Turn off all unnecessary electrical loads.Ensure the booster battery is 12-volt and has its negative terminal grounded.Park a functional car with the booster battery next to the car with the dead battery, making sure that the two vehicles are NOT in contact.If they don’t, find someone with jumper cables. Find someone with a car whose battery is not dead.To jump-start your car, you will need two things: jumper cables and a car whose battery is not dead. ![]()
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