What Are the Reasons for Failing to Start Even with a Jump Start?
2 Answers
Reasons why a car battery still fails to start even after a jump start: Battery depletion: If the vehicle has been parked for a long time without use, the battery naturally discharges, leading to depletion and the inability to start the vehicle; Insufficient current: The jump-start cables are too thin, resulting in inadequate current, improper operation during the jump start where the cables are not securely clamped or the rescue vehicle is not started, causing insufficient voltage and current; Other reasons: The vehicle's battery that needs a jump start has been depleted multiple times and can no longer hold a charge, indicating severe damage; The vehicle and the rescue vehicle used for the jump start were not kept in the off state; Check the sequence of connecting the jump-start cables—first connect the positive terminal of the dead battery to the positive terminal of the rescue vehicle, then connect the negative terminal of the dead battery to the negative terminal of the rescue vehicle.
Having driven for many years, I've seen all kinds of situations. It's particularly common to encounter cases where jump-starting still can't get the car going, usually because the starter motor is completely dead or the battery is too old to hold a charge. If the motor doesn't make any sound, it's mostly either stuck or there's a short circuit in the wiring. Next, consider the ignition system—issues like failed spark plugs or ignition coils can prevent the engine from starting. Problems with the fuel delivery system are also possible, such as a faulty fuel pump causing the engine to run dry. There's also the chance of the electronic control unit accidentally locking up, requiring a reset. For prevention, I recommend checking the battery voltage monthly to avoid such troubles. Don't try to fix it yourself to prevent damaging more components; for safety's sake, taking it to a professional repair shop is the right solution.
