Chevrolet Classic Parking Light Bulb Size

The Chevrolet Classic parking light requires a 3157NA bulb size for the specific lighting component located on the front of the vehicle. Data for the bulb specifications covers the range from 2004 to 2005.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2004-2005	3157NA

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W.	3157NA

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Additional Notes

The 3157NA is the specified parking light bulb for the Chevrolet Classic across the 2004-2005 model years.
The 3157NA follows the ANSI standard, which is the recognized electrical component specification system used in the United States and Canada.
This bulb type features a dual-filament design, meaning it contains two separate filaments within a single housing, allowing it to serve two distinct lighting functions at different wattages.
The T25 wedge base is a push-in style connector that does not use a separate socket retainer, relying instead on the tension of the base itself to hold the bulb in place.
The natural amber glass of the 3157NA produces its amber output through the color of the glass envelope itself rather than through a coating or lens filter.
The bulb operates on a 12-volt electrical system, consistent with standard automotive DC voltage.
The dual wattage rating of 27W/7W corresponds to the two filaments: the higher draw for the brighter function and the lower draw for the reduced-intensity function.
The 3157 bulb family includes several variants distinguished by suffixes, and substituting a different variant, such as a clear 3157 in place of the 3157NA, would alter the amber output at the lens.