As mentioned the most common causes for the warning light are worn belts or cables as well as a battery with a dead cell.
Red battery light car.
This is a system test that indicates the battery light on the dash along with any monitored components of the charging system are working as expected.
The car s battery light coming on generally means that there is something preventing your car s electric system from charging off the battery.
It s important to know how to respond when your car s battery light goes on.
This can be a result of a malfunctioning alternator a battery going bad or a number of other things.
The battery light is the only warning indicator for the electrical charging system of your car and should never be ignored.
Stay calm check your vehicle gauges and reduce power until you re.
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.
Your car s battery light is an indicator of when your car s charging system is malfunctioning.