There are many reasons why your automatic headlights may not be functioning properly. If you have recently purchased a vehicle that has automatic headlights, it is important to understand how they work and the common causes of their failures. The most likely cause of failure is a faulty light switch or sensor. A malfunctioning switch or sensor can prevent the lights from turning on automatically when it gets dark outside, or in other cases, turn the lights off too early while driving at night. It could also be due to an electrical issue such as blown fuses, bad wiring connections, corrosion in connectors/fuses or even a problem with the car's computer system which controls these functions. Other possible issues include malfunctioning daytime running lights (DRLs) sensors that may affect the functionality of automatic headlights; low battery voltage and headlight bulbs that need replacing due to age and wear-and-tear over time. To identify what's causing your auto headlights not working correctly it’s best to consult with an experienced technician who can diagnose and repair any underlying faults quickly and effectively so you can drive safely during hours of darkness again soon!