Mack RM Courtesy Bulb Size
The Mack RM courtesy light uses 912 and 1003 bulb sizes according to the provided specifications for the vehicle lighting system. The available data covers the range from 1981 to 1993.
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 |
|---|---|
| 1993 | 912 |
| 1992 | 1003 |
| 1991 | 912 |
| 1988-1990 | 1003 |
| 1985-1987 | 912 |
| 1982-1984 | 1003 |
| 1981 | 912 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Wedge bulb (T15). Variant of 921. 12V, 12W. | 912 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1003 |