1996 Mercury Sable Owner's Manual - Page 344

To install a bulb: 1. With the flat side of the bulb's plastic base facing upward, insert the glass end of the bulb into the socket. You may need to turn the bulb left or right to line up the grooves in the plastic base with the tabs in the socket. When the grooves are aligned, push the bulb into the socket until the plastic base contacts the rear of the socket. Slip the bulb retaining ring over the plastic base until it contacts the rear of the socket. Lock the ring into the socket by rotating it clockwise until you feel a "stop". Push the electrical connector into the rear of the plastic base until it snaps, locking it into position. Turn the headlamps on and make sure that they work properly. If the headlamp was correctly aligned before you changed the bulb, you should not need to align it again. 2. 3. 4. Aiming Headlamps Your vehicle is equipped with a Vehicle Headlamp Aim Device (VHAD) on the headlamp reflector extension and headlamp housing. Each headlamp may be properly aimed in the horizontal direction (left/right) and the vertical direction (up/down) by performing the steps outlined in the following paragraphs. The horizontal aim must be adjusted first. Tools required: One 4mm box wrench or open end wrench. 317