Ford L9000 Map Light Bulb Size

Additional Notes

• The Ford L9000 uses the 912 bulb for the map light across all listed model years, spanning 1981-1997.
• The 912 is an ANSI-standardized bulb type, meaning it conforms to a defined specification recognized across the United States and Canada.
• The 912 belongs to the T15 form factor, which refers to a tubular wedge-style bulb with a base width of approximately 15 eighths of an inch.
• A wedge base bulb relies on the tension of its plastic base held between two contacts in the socket, rather than a separate metal cap or pins.
• The 912 operates at 12 volts and draws 12 watts, placing it in the low-wattage range typical of interior courtesy and map lighting applications.
• The 912 is noted as a variant of the 921 bulb. While the two share the same T15 wedge form factor and 12-volt rating, the 921 is rated at 18 watts, making the two electrically non-equivalent despite their physical similarity.
• The physical interchangeability of the 912 and 921 does not imply functional interchangeability in the Ford L9000 map light socket, as the wattage difference affects both brightness and the thermal load placed on the socket and surrounding trim.