Ford F-350 Courtesy Bulb Size
The Ford F-350 courtesy light utilizes unique bulb sizes 912, 561, 89, 1891, 631, 1004, and 1003. Available data covers the range of 1956 through 1997 for the specified lighting components.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Bulb Size by Year Range
| Years | Bulb Size |
|---|---|
| 1997 | 912 |
| 1996 | 561 |
| 1995 | 912 |
| 1994 | 89 |
| 1992-1993 | 912 |
| 1991 | 89 |
| 1981-1990 | 912 |
| 1980 | 1891 |
| 1969-1972 | 631 |
| 1964-1968 | 1004 |
| 1956 | 1003 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Wedge bulb (T15). Variant of 921. 12V, 12W. | 912 |
| ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W. | 561 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W. | 89 |
| ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W. | 1891 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W. | 631 |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1004 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1003 |