Chevrolet Blazer Parking Light Bulb Size

Additional Notes

• The 3157 and 3157NA are the most frequently specified bulb types across the Chevrolet Blazer parking light fitment data, covering model years 1995-2003. Both are dual-filament T25 wedge bulbs rated at 12V with a 27W high filament and 7W low filament under the ANSI standard. The distinction between the two is the natural amber glass coating on the 3157NA, which produces amber-colored output without a separate amber lens.
• The 7444NA, specified for the 2019-2020 Chevrolet Blazer, is a dual-filament T20 wedge bulb rated at 12V, 21W/5W with natural amber glass. Its lower wattage ratings compared to the T25-based bulbs used in earlier model years reflect a physically smaller form factor, and the two wedge sizes are not interchangeable despite both using a wedge-style base.
• The 2057 and 2057NA share identical electrical ratings of 12V, 26.9W/8W and use a BAY15d bayonet base, differing only in that the 2057NA carries a natural amber glass coating. Both are described as brighter variants of the 1157 bulb. The 2057NA appears in the 1987-1988 and 1993-1994 model years, while the clear 2057 is specified for the 1992 model year with sealed beam headlamps.
• The 1992 model year carries two separate parking light specifications depending on headlamp type. The 2057 applies to vehicles with sealed beam headlamps, while the 3057 applies to those with halogen capsule headlamps. These two bulbs differ in base type, with the 2057 using a BAY15d bayonet base and the 3057 using a T25 wedge base, making them physically incompatible with each other's sockets.
• The 3057 and 3057NA are dual-filament T25 wedge bulbs rated at 12V, 27W/7W, sharing the same electrical characteristics as the 3157 and 3157NA. The 3057 series is specified for the 1990-1992 model years. While the wattage ratings of the 3057 and 3157 families match, substitution between them may not be appropriate without confirming socket and fitment compatibility.
• The 194NA, specified solely for the 1989 model year, is a single-filament miniature T10 wedge bulb rated at 12V, 3.78W. Its wattage is substantially lower than all other bulb types in the data set, and its single-filament design contrasts with the dual-filament bulbs used in surrounding model years, indicating a different socket configuration for that year.
• The 198 bulb, used across the 1971-1974 model years, is a miniature T5 wedge type rated at 12V, 2W, making it the lowest-wattage specification in the data set. The 97 bulb, specified for 1969-1970, is a single-filament type with a BA15s bayonet base rated at 12V, 13W and is described as a variant of the 1156. These two base styles, T5 wedge and BA15s bayonet, are not interchangeable.
• Several bulb types across the specifications carry the "NA" suffix, denoting natural amber glass. This coating is integral to the bulb itself rather than applied externally, and these variants are used where amber-colored light output is required by the vehicle's design without relying on a colored housing or lens to produce that effect.