How do I know if I need an alternator or battery?
How do I know if I need an alternator or battery? An illuminated dashboard light can indicate a problem with an automobile charging system. However, a very simple way to check if the alternator is working is to run the car and disconnect the positive terminal of the battery. If the vehicle stops running, then you probably have a bad alternator. What happens to the battery when the alternator is not working? The battery supplies the car with power when the car is not running. That is why you can sit and listen to the radio with the engine turned...