Mack F Courtesy Bulb Size
The Mack F courtesy light utilizes 1003 and 912 bulb sizes for the specific lighting components located within the interior of the vehicle. Data for the bulb sizes covers the range from 1981 to 1982.
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 |
|---|---|
| 1982 | 1003 |
| 1981 | 912 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1003 |
| ANSI standard (US & Canada). Wedge bulb (T15). Variant of 921. 12V, 12W. | 912 |