Q: How to remove and install the front turn signal and parking lights, and How to headlight and fog lamp alignment on 1989 Nissan 240sx?
A: To remove and install the front turn signal and parking lights, first take off the lens using the retaining screws, then slightly depress the bulb and turn it counterclockwise to release it. For installation, push down and turn the bulb clockwise simultaneously before securing the lens with the retaining screws. For side marker lights, remove the lens with the retaining screws, turn the bulb socket counterclockwise to release it, and pull the bulb straight out. To install, push the bulb straight in and turn the socket clockwise before securing the lens. For rear turn signal, brake, and parking lights, if necessary, remove the rear trim panel to access the bulb socket, depress the bulb and turn it counterclockwise to release it, then push down and turn clockwise to install. If applicable, reinstall the trim panel. For headlight alignment, ensure the headlamps are adjusted with a special tool, verifying the operation of the dimmer and high beam indicator, inspecting components that may affect alignment, ensuring proper tire inflation, cleaning headlamp lenses, and ensuring the trunk is free of heavy loads with a full fuel tank. Position the vehicle on a level surface 25 feet from a flat wall, tape a line at the vehicle's center line, stabilize the suspension by rocking the vehicle, and measure the distance from the headlamp lens to the floor and from the center line to each headlamp for adjustment references. A properly aimed low beam should project a high-intensity pattern on the alignment screen from 2 inches above to 2 inches below the headlamp center line, with the side-to-side pattern extending 2 inches left and right. For halogen applications, the high beam pattern should align correctly when low beams are properly adjusted. Adjust the alignment screws to achieve the specified pattern. For fog lamp alignment, ensure the pattern projects 4 inches below the fog lamp center line and straight ahead.