Chevrolet Chevelle Turn Signal Indicator Bulb Size

Additional Notes

• The Chevrolet Chevelle turn signal indicator bulb specifications span the 1964-1973 model years, covering four distinct bulb types across that period: the 168, 194, 1895, and 1445.
• The 1895 is the most frequently specified bulb across this range, appearing in six consecutive model years from 1966-1971. It is an ANSI-standard miniature wedge bulb with a T5 envelope, rated at 12V and 0.9W.
• The 1445 bulb is specified for the Chevrolet Chevelle for the 1964-1965 model years. Unlike the wedge-base bulbs used in later years, the 1445 uses a BA9s bayonet base with a single filament, rated at 12V and 2W.
• The BA9s base on the 1445 is a small bayonet-style cap, which is physically incompatible with the wedge-style sockets used by the 1895, 194, and 168 bulbs. The 1964-1965 Chevelle therefore requires a different socket type than all later model years in this specification set.
• The 1972 model year uses the 194 bulb, a T10 miniature wedge type rated at 12V and 3.78W. Although the 1973 model year also uses a T10 wedge bulb, it specifies the 168, which draws 4.9W, making the two bulbs electrically distinct despite sharing the same base type.
• The 168 and 194 share the T10 wedge form factor and are physically interchangeable in terms of socket fitment, but their wattage ratings differ. Substituting one for the other may affect indicator brightness and could place unintended electrical load on the circuit.
• All four bulb types in these specifications conform to ANSI standards recognized in both the United States and Canada, indicating standardized electrical and physical tolerances across the range.
• The T5 envelope of the 1895 is narrower than the T10 envelope of the 168 and 194. The numerical designation in the T-series refers to the width of the bulb in eighths of an inch, so a T5 measures 5/8 inch and a T10 measures 10/8 inch (1.25 inches) across the widest point of the glass.
• The 1895 at 0.9W is the lowest-wattage bulb in the specification set, while the 168 at 4.9W is the highest. This range of wattage values across the model years reflects differing current draw requirements that are not interchangeable without consideration of the vehicle's indicator circuit design.
• The transition from the 1895 to the 194 between the 1971 and 1972 model years represents a change in both wattage and envelope size while retaining the wedge base format, meaning the socket type remained compatible but the electrical characteristics changed.