Mack WS Courtesy Bulb Size
The Mack WS courtesy light requires bulb sizes 1003 and 912 for the specific lighting components located inside the vehicle cabin. Data for the bulb sizes covers the range from 1981 through 1984.
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 |
|---|---|
| 1983-1984 | 1003 |
| 1981-1982 | 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 |