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What's the reason for having power in the battery but no power in the entire vehicle?

2 Answers

IkerMarie

07/28/25 11:48pm

The reasons for having power in the battery but no power in the entire vehicle include blown fuse tubes; faulty power lock; poor contact at battery terminals or connectors; damaged battery; or broken soldering joints in battery wiring. Below is an extended explanation: 1. Detection method: Use a multimeter in voltage mode to check the battery's output voltage. If there is no voltage, inspect the fuse tubes, fuse holders, battery, and battery wiring for any breaks. If the battery output voltage is normal, check the voltage at the controller's power input. If there is no voltage, examine the ignition lock and wiring for any breaks or poor connections. 2. Introduction to electric vehicles: Electric vehicles refer to cars that use electrical energy as a power source and are driven by electric motors. They belong to the category of new energy vehicles, including: Battery Electric Vehicles (BEV), Hybrid Electric Vehicles (HEV), and Fuel Cell Electric Vehicles (FCEV).

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Lester

08/12/25 4:07am

I've encountered this issue quite a few times, mainly caused by a blown main fuse or loose battery terminal connections. As someone who frequently tinkers with cars, here's my analysis: The battery itself has power, but the electricity can't reach the vehicle systems—this could be due to current overload burning out the main fuse (which acts like a main circuit breaker), or loose/dirty battery terminal clamps causing poor contact. When checking, first ensure the terminals are tightened and free of rust (clean any corrosion with sandpaper). Then open the engine bay fuse box to inspect the largest fuse—replace it with an identical amperage fuse if blown. Faulty relays or loose ground wires can cause similar symptoms. I once had this failure on the road and nearly got stranded—pulled over immediately for quick checks. For complex issues like ECU or anti-theft system errors, don't hesitate—visit a professional repair shop immediately as safety comes first. Regular maintenance like cleaning battery terminals and checking fuses can prevent such problems.

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