GMC 250 Turn Signal Bulb Size
GMC 250 front and rear turn signal bulbs utilize 3 distinct sizes: 1073, 1034, and 1129, with each bulb size representing a specific configuration for the turn signal assembly. The replacement chart covers 1951 through 1959 production years, detailing which bulb size corresponds to each model year within that range.
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 |
|---|---|
| 1958-1959 | 1073 |
| 1957 | 1034 |
| 1956 | 1073 |
| 1951-1955 | 1129 |
Rear Turn Signal
| Years | Bulb Size |
|---|---|
| 1959 | 1073 |
| 1956-1958 | 1034 |
| 1951-1955 | 1129 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| 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. | 1034 |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1129 |