Mack MH Courtesy Bulb Size
The Mack MH courtesy light utilizes 1003 and 912 bulb sizes for interior illumination across various production periods. Data for the specified components covers the span from 1983 through 1994.
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 |
|---|---|
| 1993-1994 | 1003 |
| 1991-1992 | 912 |
| 1990 | 1003 |
| 1989 | 912 |
| 1988 | 1003 |
| 1987 | 912 |
| 1986 | 1003 |
| 1984-1985 | 912 |
| 1983 | 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 |