Chevrolet Chevy II Turn Signal Indicator Bulb Size

The Chevrolet Chevy II turn signal indicator requires bulb size 1895 or 257 depending on the specific application. Data for the bulb requirements covers the range from 1962 to 1968.

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
1964-1968	1895
1962-1963	257

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 0.9W.	1895
ANSI standard (US & Canada). Festoon or BA9s base instrument bulb. 12V, 2W.	257

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Additional Notes

The Chevrolet Chevy II uses two distinct bulb types across its 1962-1968 model years for the turn signal indicator: the 1895 and the 257, both conforming to ANSI standards recognized in the United States and Canada.
The 1895 is a miniature wedge bulb in the T5 form factor, rated at 12 volts and 0.9 watts. The T5 designation refers to a tubular bulb with a width of 5/8 inch, commonly used in instrument cluster and indicator applications.
The 257 is rated at 12 volts and 2 watts, and it is available in either a festoon or BA9s base configuration. A festoon bulb is cylindrical with end caps, while a BA9s is a small single-contact bayonet base, meaning these two physical forms are not interchangeable with each other despite sharing the same ANSI designation.
The Chevrolet Chevy II (1964-1968) uses the 1895 bulb for the turn signal indicator. Its wedge base design requires no separate socket retainer, as the bulb is held in place by the socket walls alone.
The 1962-1963 Chevy II uses the 257 bulb for the turn signal indicator. At 2 watts, it draws slightly more power than the 1895 used in later model years.
The 1895 and 257 bulbs are not interchangeable. They differ in base type, wattage, and physical form factor, making cross-year substitution between the 1963 and 1964 model years incompatible without modification.