GMC G1500 Turn Signal Bulb Size

GMC G1500 front and rear turn signal bulbs utilize multiple size options including 12961, 3157NA, 2057NA for front applications and 2057, 1157, 1034 for rear applications. The replacement chart covers 1964 to 1995 production years with corresponding bulb size specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Turn Signal

YearsBulb Size
199512961 (For vehicle with Grille, Radiator (Chrome))
3157NA (For vehicle without Grille, Radiator (Chrome))
1992-19943157NA
1983-19912057NA
1979-19821034NA
19661156
1964-19651073

Rear Turn Signal

YearsBulb Size
1983-19952057
1979-19821157
19661034
1964-19651156

Bulb Specifications

Description Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.12961
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W.3157NA
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. Variant of 1157. 12V, 21/5W.1034NA
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.1156
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. Brighter variant of 1157. 12V, 26.9W/8W.2057
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.1157
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.1034

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