GMC G3500 Turn Signal Bulb Size
The GMC G3500 front inner turn signal uses a 3157NA bulb size, while the front outer turn signal requires a 194NA bulb size, with additional front options including 2057NA and 1157NA sizes. The replacement chart covers 1979 to 1996 model years and documents turn signal bulb specifications for both front and rear positions.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Front Inner Turn Signal
| Years | Bulb Size |
|---|---|
| 1995-1996 | 3157NA |
Front Outer Turn Signal
| Years | Bulb Size |
|---|---|
| 1995-1996 | 194NA |
Front Turn Signal
| Years | Bulb Size |
|---|---|
| 1992-1996 | 3157NA |
| 1983-1991 | 2057NA |
| 1982 | 1157NA |
| 1981 | 1034NA |
| 1980 | 1157NA |
| 1979 | 1034NA |
Rear Turn Signal
| Years | Bulb Size |
|---|---|
| 1983-1996 | 2057 |
| 1979-1982 | 1157 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W. | 3157NA |
| ANSI standard (US & Canada). Miniature wedge bulb (T10), natural amber glass. 12V, 3.78W. | 194NA |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, natural amber glass. Brighter variant of 1157. 12V, 26.9W/8W. | 2057NA |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, natural amber glass. 12V, 21W/5W. | 1157NA |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, natural amber glass. Variant of 1157. 12V, 21/5W. | 1034NA |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Brighter variant of 1157. 12V, 26.9W/8W. | 2057 |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W. | 1157 |