How to Replace a Car Headlight. Replacing a burned-out bulb or headlight on your car is relatively easy. Cars will have one of two designs: On some cars, you replace only the small halogen bulb inside the larger glass headlamp, and on other cars (usually older ones), the inner bulb and larger headlamp are one piece that must be replaced. Read more: www.ehow.com/video_2630_replac...