If the car’s dashboard battery light comes on, you might be able to make it home or to a service facility for a repair. Among other signs that the alternator or other parts of the charging system aren’t working are dim headlights or the clock losing time.
The charging system warning light should show for a few seconds when you start the car, but if the battery light shows while you’re driving the vehicle, that light signals a problem. This article refers primarily to conventional vehicles with conventional 12-volt batteries more electrified vehicles and those higher-voltage electrical systems will vary. The car battery itself may be the cause if it has corroded cable terminals, bad wiring, damaged cells or plates inside or if it is leaking electrolyte. If the alternator fails, or the accessory belt that drives the alternator is loose or broken, then you’ll end up with a dead battery because the bad alternator isn’t recharging the battery. The alternator generates the power that is stored in the battery.
The cause of the battery light could be a loose or corroded battery cable or other wire connecting components of the charging system, or it might be a problem with the alternator or voltage regulator. CARS.COM - If the battery warning light (a light in the shape of a battery symbol) on the dashboard comes on while you’re driving, that means the charging system isn’t working, but the fault may lie in something other than the battery.
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