Mack FDM Turn Signal Bulb Size
The Mack FDM uses 1157 bulb size for both front and rear turn signal applications. Replacement chart data covers 1990 to 1992 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Front Turn Signal
| Years | Bulb Size |
|---|
| 1990-1992 | 1157 |
Rear Turn Signal
| Years | Bulb Size |
|---|
| 1990-1992 | 1157 |
Bulb Specifications
| Description |
Bulb Size |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W. | 1157 |