Mack CH Courtesy Bulb Size
The Mack CH courtesy light uses 912 and 1003 bulb sizes across the various production versions listed in the provided technical data. The available information covers a specific time span starting in 1989 and ending in 1997.
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 | 1003 |
| 1993-1996 | 912 |
| 1991-1992 | 1003 |
| 1990 | 912 |
| 1989 | 1003 |
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 |