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What is the method for jump-starting a car with a dead battery?

2 Answers

DeStephanie

07/29/25 9:05am

Car jump-starting method with a dead battery is: 1. Prepare two jumper cables and a vehicle that can supply power; 2. Remove the battery box clips to open the battery protective cover, exposing the positive and negative terminals of the battery; 3. Take one jumper cable, connect one end to the positive terminal of the dead battery and the other end to the positive terminal of the live battery, ensuring the positive and negative terminals do not touch to avoid short-circuit hazards; 4. Take the other jumper cable, first connect it to the negative terminal of the live battery, then connect the other end to the engine block or body of the dead vehicle, avoiding negative-to-negative connection; 5. Once the cables are connected, start the live vehicle to provide a reliable voltage to the dead vehicle, completing the jump-start.

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GageDella

08/12/25 8:18am

Last time my car ran out of battery, I asked a friend to help with a jump start by the roadside. We parked both cars close together without touching and opened the hoods. First, I took out the red and black jumper cables. The red cable was connected to the positive terminals marked red on both car batteries. One end of the black cable was connected to the negative terminal (black) of the donor car, and the other end was grounded to the metal frame or a bolt of the dead car—never directly to the negative terminal of the dead battery to avoid sparking or explosion. We started the donor car and let it run for a few minutes to charge. Then, I tried to start my car. Once it started successfully, I let the engine idle for at least ten minutes to recharge the battery before driving off. When disconnecting, I removed the grounded black cable first, then the other end of the black cable, and finally the red cables. I wore gloves and goggles for protection the whole time. After the jump start, I checked if the battery was old or if lights were left on causing a drain. I recommend keeping a portable jump starter as a backup—safety comes first when driving, and you can’t be too careful.

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