Chevrolet Colorado Tail Light Bulb Size

Additional Notes

• The Chevrolet Colorado uses two distinct tail light bulb sizes across its model years, with the 3057 fitted to the 2004-2012 model years and the 7443 fitted to the 2015-2020 model years.
• Both the 7443 and 3057 are dual-filament wedge bulbs, meaning each unit contains a high-intensity filament for brake and turn signal functions and a lower-intensity filament for running light functions.
• The 7443 is a T20 wedge bulb rated at 12V with a 21W/5W filament configuration, where 21W serves the brighter function and 5W serves the dimmer running light function.
• The 3057 is a T25 wedge bulb rated at 12V with a 27W/7W filament configuration, producing a higher wattage output on both filaments compared to the 7443.
• The T25 housing of the 3057 is physically larger than the T20 housing of the 7443, which means the two bulb types are not interchangeable despite both using a wedge-style base.
• Both bulb types conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical tolerances across manufacturers.
• The 7443 and 3057 share the same operating voltage of 12V, consistent with standard automotive electrical systems.
• The wattage difference between the two bulbs, particularly on the primary filament (21W for the 7443 versus 27W for the 3057), reflects a difference in light output intensity between the two generations of Colorado tail light assemblies.