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Asked by: Petre Dudnik
automotive road side assistanceWhy would a car not start with jumper cables?
Last Updated: 6th February, 2020
Inexpensive jumper cables that are not thick enough to carry sufficient current won't perform to the level you expect, and your car won't start after a jump. Cables that are too long have more internal resistance, and they may not transfer enough of the donor battery's power to your car.
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Moreover, what happens if you jump a car that's not dead?
But if the “dead” car cranks vigorously and just doesn't start, the problem is probably something other than the battery, and jump-starting will not help. In fact, the more charge remains in the discharged battery, the quicker the jump-starting process will be.
Furthermore, can you jump start a completely dead car battery? If you're stuck with a dead battery, you can start the car by using jumper cables to connect the bad battery to a fully charged one, whether or not it's fitted to another vehicle. Here's a guide on how to jump start a car, assuming that the charged battery is fitted to another vehicle.
Furthermore, can you jump a car that is completely dead?
Yes you can bring most even really dead batteries back to life with a jump from a running car. However note that most cheap battery jumper cables don't carry enough current to make this happen very quickly.
Why don't you connect the negative when jumping a car?
Caution: Don't attach the negative cable to the negative terminal of the weak battery when jumping a car battery! This common mistake could ignite hydrogen gas directly over the battery. Battery explosions can cause serious injury. Finally, remove the positive cable from the car with the weak battery.