Maintaining functioning car lights is crucial for safe driving. If a headlamp goes out, follow these steps to replace it safely. Begin by identifying the type of headlamp your vehicle uses—sealed beam or composite. For composite headlamps, remove the wiring harness, retainer, and old bulb, then install the new bulb and test it. Sealed beam headlamps require removing the protective bezel, disconnecting the wiring connector, and replacing the headlamp before reassembling. For taillights, determine access from inside or outside the vehicle, remove the old bulb, insert the new one, and test functionality. Remember to handle bulbs carefully and seek professional assistance for electrical issues.