Chevrolet S10 front and rear turn signal bulbs utilize 3157, 3157NA, 2057, 3057, and 1157 sizes depending on location and model variation. The replacement chart covers 1982 through 2004 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.
The Chevrolet S10 front turn signal specifications cover model years 1982-2004 and reference three distinct bulb types across that span: the 1157, 2057, and 3157/3157NA.
The 1157 is a dual-filament bulb rated at 12V with a 21W high filament and 5W low filament, using a BAY15d bayonet base. It is specified for the front and rear turn signals on the S10 from 1982-1990.
The 2057 shares the same BAY15d bayonet base as the 1157 but operates at higher wattages of 26.9W and 8W, making it a brighter variant. It is specified for both front and rear positions on the S10 for 1991-1993.
Because the 1157 and 2057 share the BAY15d bayonet base, they are physically interchangeable in terms of socket fit, though their filament wattages differ and the two types are not electrically equivalent.
The 3157 and 3157NA are T25 wedge-type dual-filament bulbs rated at 12V, 27W/7W. Unlike the 1157 and 2057, they use a wedge base rather than a bayonet base, making them incompatible with sockets designed for BAY15d bulbs.
The 3157NA is the natural amber glass version of the 3157, producing an amber output from the bulb itself rather than relying on a colored lens. It is specified for the Chevrolet S10 front turn signal for 1994-1998.
For the 2004 model year, the front turn signal uses the clear-glass 3157 rather than the amber 3157NA, indicating a difference in lens or housing design compared to the 1994-1998 years.
The 3057 is also a T25 wedge-type dual-filament bulb rated at 12V, 27W/7W, sharing the same wattage ratings as the 3157. It is specified exclusively for the rear turn signal position on the S10 for 1994-1998 and 2004.
Although the 3057 and 3157 share identical voltage and wattage ratings, they are distinct part numbers and may differ in filament orientation or base configuration, which can affect fitment in a given socket.
All five bulb types referenced in the S10 turn signal specifications conform to ANSI standards recognized in both the United States and Canada, indicating standardized electrical and physical tolerances across the range.