GMC 150 Turn Signal Bulb Size
The GMC 150 front and rear turn signal bulb sizes include 1034, 1073, 1129, and 1156 options, with the bulb size varying by application and model configuration. A replacement chart documents specifications across the 1951 to 1959 production range for this vehicle.
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 |
|---|---|
| 1959 | 1034 |
| 1957-1958 | 1073 |
| 1956 | 1034 |
| 1951-1955 | 1129 |
Rear Turn Signal
| Years | Bulb Size |
|---|---|
| 1959 | 1073 |
| 1958 | 1156 |
| 1956-1957 | 1073 |
| 1951-1955 | 1129 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1034 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W. | 1073 |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1129 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1156 |