GMC Safari front turn signal bulbs utilize 3157NA and 2057 sizes, while rear turn signal bulbs use 2057 size specifications. The replacement chart covers 1985 through 2005 model years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The GMC Safari uses two distinct front turn signal bulb types across its production span. The 3157NA was specified for the 1995-2005 model years, while the 2057 was specified for the 1985-1994 model years.
The 3157NA is a dual-filament T25 wedge bulb rated at 12V with a high-filament draw of 27W and a low-filament draw of 7W. Its natural amber glass produces the orange turn signal color without relying on a tinted lens or housing.
The 2057 is a dual-filament bulb rated at 12V with a high-filament draw of 26.9W and a low-filament draw of 8W. It uses a BAY15d bayonet base, which is a two-pin offset base that physically prevents incorrect installation orientation.
The 2057 is noted as a brighter variant of the 1157. While the two types share the same BAY15d bayonet base and are physically interchangeable in many sockets, the 2057 produces greater light output on its high-filament setting.
The GMC Safari uses the 2057 for the rear turn signal across all model years covered in the specifications, from 1985 through 2005.
The front and rear turn signals of the GMC Safari share the same bulb type for the 1985-1994 model years, both positions using the 2057. From 1995 onward, the front and rear positions use different bulb types.
Both the 3157NA and the 2057 conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and photometric performance for both types.
The 3157NA uses a wedge-style base rather than a bayonet base, making it physically incompatible with sockets designed for the BAY15d bayonet mount used by the 2057. The two bulb types are not interchangeable despite sharing a dual-filament configuration.