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Why is the car completely out of power?

2 Answers

DiOwen

07/25/25 2:33am

Here are the specific reasons for a car experiencing a complete power loss: 1. The car's alternator malfunctions. A car's power supply system consists of two main components: the battery and the alternator. When the engine starts, the battery supplies a strong current to the starter motor, which operates to initiate the engine's first working cycle, while also providing power to the ignition system and fuel pump to keep the engine running. 2. Electrical circuit issues, such as the body wiring harness grounding or modified circuits causing excessive current that burns out the wires. A car's electrical circuit failure prevents the battery's power from reaching the entire vehicle. 3. The vehicle's fuse circuit burns out or has poor contact, among other issues. In case of a complete power loss, it is advisable to promptly visit a repair shop for troubleshooting and repairs.

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Riley

08/10/25 4:37pm

I've been a seasoned mechanic in the auto repair shop for decades, and I often encounter car owners complaining about a complete loss of power in their vehicles. Nine times out of ten, the issue stems from an aging or damaged battery. Over time, battery performance can sharply decline due to insufficient charging or significant temperature fluctuations—for example, internal sulfation can cause voltage drops. Another common culprit is a faulty alternator, which is responsible for charging the battery. If the belt is loose or components are worn out, the charging system fails, leaving the car unable to start. Wiring issues, such as blown fuses or short circuits, can also be to blame, often caused by aftermarket audio installations or electrical overloads. When this happens, don’t panic. First, use a multimeter to check the battery voltage—if it’s below 12 volts, the battery is likely dead. For alternator issues, the voltage will fluctuate after starting the engine. I recommend checking the battery terminals monthly for looseness or corrosion and scheduling regular professional maintenance to avoid many of these headaches.

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