Which light warns you if the vehicle's electrical system is having issues?

The alternator warning light is specifically designed to alert the driver when there is an issue with the vehicle's electrical system, particularly related to the alternator or the charging system. When this light illuminates, it indicates that the alternator is not functioning properly, which can lead to a failure to charge the battery effectively. This could result in the vehicle running solely on battery power, which is unsustainable and will eventually lead to difficulties starting the vehicle or electrical failures.

While other lights may indicate problems that could indirectly relate to the electrical system, such as the check engine light or the battery light, they are more general indicators of broader issues within the engine management or battery system. In contrast, the alternator warning light provides a direct and specific warning regarding the performance of the electrical system, making it the correct answer for this particular question.