Chevrolet Corvette Turn Signal Indicator Bulb Size

Additional Notes

• The bulb 194 is the most frequently specified type across the Chevrolet Corvette turn signal indicator fitments in these specifications, covering the 1979-1982 and 1984-1989 model years. It is an ANSI-standard miniature wedge bulb in a T10 form factor, rated at 12V and 3.78W.
• The bulb 1895 covers the 1968-1973 model years and is an ANSI-standard miniature wedge bulb in a T5 form factor, rated at 12V and 0.9W. The bulb 1896, specified for the 1953-1954 Corvette, shares the same T5 form factor and 12V/0.9W rating, though the two carry distinct ANSI designations and are not listed as interchangeable.
• Three T10 wedge bulbs appear across these specifications: the 161 (1W), the 194 (3.78W), and the 168 (4.9W). Although all three share the T10 form factor, their wattage ratings differ substantially, and substituting one for another may not conform to the original circuit design.
• The bulb 74, a T5 miniature wedge rated at 12V and 1.4W, is specified for the 1985-1987 and 1991-1992 model years. Its T5 form factor is physically similar to that of the 1895 and 1896 bulbs, but the wattage and ANSI designation differ across all three types.
• The bulb 1816, specified for the 1963-1966 Corvette, uses a T3.25 form factor, the smallest bulb envelope present in these specifications. It is rated at 12V and 4W, giving it the highest wattage among the T-wedge types listed here.
• The bulb 257, covering the 1958-1963 model years, is described as a festoon or BA9s base instrument bulb rated at 12V and 2W. The BA9s bayonet base type is physically distinct from wedge-base bulbs, meaning it is not interchangeable with any of the T-series wedge types listed in these specifications.
• The bulb 53, specified for the 1955-1957 Corvette, is a single-filament bulb with a BA9s base, also rated at 12V and 2W. While it shares the BA9s base with the 257, the two carry separate ANSI designations and are not listed as direct substitutes for one another.
• The 1978 Corvette is the sole model year in these specifications assigned the 168 bulb, a T10 wedge rated at 12V and 4.9W. The adjacent model years use the 194 bulb instead, which operates at a lower wattage within the same T10 form factor.
• All bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada, indicating a shared regulatory framework for the electrical ratings and physical designations assigned to each type.
• The specifications reflect at least six distinct bulb types across the turn signal indicator position of the Corvette, spanning wedge bases in T3.25, T5, and T10 envelopes as well as BA9s-base types. This variation across model years means fitment is year-specific and cross-year substitution is not supported by these specifications.