Mack RS Courtesy Bulb Size
The Mack RS courtesy bulb utilizes 2 distinct sizes: 912 and 1003. A replacement chart documents vehicle production specifications spanning 1981 to 1989.
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 |
|---|---|
| 1989 | 912 |
| 1985-1988 | 1003 |
| 1983-1984 | 912 |
| 1982 | 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 |