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Battery Light on Car ON While Driving

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If the battery light on the car is ON while driving, it means a problem on the charging system, usually this is a result of a faulty alternator or a broken alternator belt.

When the ignition switch is turned to the ON position, the battery light will be on. After the engine has started, it will go off. If this battery light on car is on while the engine is running, it indicates that the car charging system has a fault. Charging system includes battery and alternator.

What does it mean when the low battery warning lights on the dashboard appear? Well, a low battery warning light means that there is a problem related to the car charging system. The low battery warning light appears if the battery is low of charge and is not charging. There are two possible reasons why the battery is not charging, the first one is the alternator is faulty and not charging and the second is the alternator belt is broken.

Warning Lights on the Dashboard
What is the warning lights on the dashboard mean? If these dashboard warning lights are lit it means something is wrong with the car to warn the driver. Read more » Warning Lights on the Dashboard

The reason why battery light come on while driving

1. Faulty alternator.
2. Broken alternator belt.

Car troubleshooting

An automobile has many electrical devices, such as the starting system, lights, radio, etc. These devices are operated by the electric current supplied from the battery and alternator. The amount of power generated depends on the alternator specification and engine speed. Power generation is automatically controlled according to the battery condition and the vehicle's electrical consumption (load) at a specific time. Generally, when the engine runs at idle the battery discharges, and as the engine speed increases the battery is charged by the alternator.

The alternator is a belt-driven device whose job is to provide an electrical charge to the car battery that powers all the car electrical equipment. The belt is then connected to the flywheel that is coupled to the engine. Since it is a belt-driven device if there is something that happens to the belt-like if the belt is broken the alternator will not function in this case no electrical charge will be given to the battery. The electrical equipment will not be used continuously because it will eventually drain the battery.

Oil Light Flashing When Driving
Oil light flashing when driving, a result of low oil pressure, the reason is low engine oil, using wrong viscosity engine oil, partly clogged oil pan. Read more » Oil Light Flashing When Driving

Car alternator and alternator belt

In either case, the Malfunction Indicator Light (MIL) which is the low battery warning symbol on the instrument cluster will lit to warn the driver that there is a problem with the charging system of the car.

What to do?
If the low battery warning light comes on while driving, just stop the car. Open the hood and locate the alternator, check the alternator, check if the belt is broken, if the alternator belt is good then the problem is a failing alternator.

How to Test an Alternator for Any Problem?
If the alternator output voltage is 13V or less, the battery continues discharging, thus the battery runs down. Read more » How to Test an Alternator

Can you drive your car with the battery light on

Yes, you can drive your car with the battery light on, it is safe to drive the car but you will only have an hour or less before the battery drains out, because only the battery will provide the electrical power required by the car without the charge coming from the alternator.

Drive the car to the nearest repair shop, asks the mechanic to check the alternator if it can be repaired or not. Usually, it is the carbon brass that causing the alternator to fail, so just replace the carbon brass.

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