Mercury Topaz Dome Light Bulb Size

Additional Notes

• The Mercury Topaz uses the 906 bulb size for the dome light across all listed model years, spanning 1984-1994.
• The 906 is an ANSI-standardized bulb type, meaning its specifications are defined by a recognized North American industry standard applicable in both the United States and Canada.
• The 906 bulb follows the T10 miniature wedge form factor, a designation that refers to its tubular glass envelope and wedge-shaped base, which seats directly into a socket without a separate metal base or pins.
• The wedge base design of the T10 means the bulb is held in place by the socket's tension alone, making it a tool-free replacement in most applications.
• The 906 operates at 12 volts, which is consistent with the standard electrical system voltage found in conventional passenger vehicles.
• The 906 carries an 8-watt power rating, placing it in the low-wattage range typical of interior courtesy lighting, where prolonged illumination without significant battery drain is a practical consideration.
• Because the 906 bulb is an ANSI-standardized type, it is produced by multiple manufacturers, and units from different sources are generally interchangeable as long as the T10 wedge base and 12V/8W ratings are matched.