1993 Buick Regal Owner's Manual - Page 238

Headlight bulbs can be changed asdescribed by the following procedure. 1. Remove the electrical connector (A) from the bulb by raising the lock tab (B) and pulling the connector down and away from the bulb's plastic base (C). 3. Install the new bulb by inserting the smallest tab (D) located on top of the plastic base into the corresponding notch in the metal retaining ring (E). Turn 1/4 turn clockwise until it stops. The small plastic tab should be at the top of the metal ring. 4. Install the electrical connector with slotted grooves toward to the front of vehicle. Taillamp Bulb Replacement 2. Press and turn the plastic base (C) a 1/4 turn counterclockwise and remove from the metal retaining ring (E) by gently pulling back and away from the headlight.