GMC G2500 Turn Signal Bulb Size

GMC G2500 front turn signal bulbs utilize 12961, 3157NA, or 2057NA bulb sizes, while rear turn signal bulbs use 2057 or 1157 sizes. The replacement chart covers 1979 through 1995 vehicle 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
1981-19821034NA
1979-19801157NA

Rear Turn Signal

YearsBulb Size
1983-19952057
1979-19821157

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). 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. Brighter variant of 1157. 12V, 26.9W/8W.2057
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.1157

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