Chevrolet Caprice Turn Signal Indicator Bulb Size

Additional Notes

• The Chevrolet Caprice turn signal indicator bulb specifications span from 1966 to 1992, covering three distinct bulb types across that period: the 168, 194, 158, and 1895.
• The 168 bulb is the most frequently specified across the listed years, covering 1977-1978, 1981-1983, and 1985-1992, with the sole exception of 1984 and 1990.
• All three of the most common bulb types in these specifications, the 168, 194, and 158, share the T10 miniature wedge form factor and operate at 12 volts, though they differ in wattage output.
• The 168 bulb operates at 4.9W, making it the highest-wattage T10 wedge bulb among those listed, while the 194 runs at 3.78W and the 158 at 3W.
• The 1895 bulb, specified for the Chevrolet Caprice in 1966-1967, uses a T5 miniature wedge form factor rather than the T10 shared by all other listed bulbs, and draws only 0.9W at 12 volts.
• Although the 168 and 194 share the same T10 wedge base, their wattage ratings differ by over one watt, which is a relevant fitment consideration since the two types are not rated as interchangeable within these specifications.
• The 1990 Caprice is specified with a 194 bulb, while the surrounding years of 1989 and 1991-1992 use the 168, indicating a single-year deviation within an otherwise consistent run.
• The 158 bulb is specified only for the 1984 model year, making it the least common bulb type across the entire listed range.
• All four bulb types listed carry ANSI standard designations recognized in both the United States and Canada, indicating standardized ratings rather than proprietary specifications.
• The shift from the T5-based 1895 bulb in 1966-1967 to the T10-based 194 beginning in 1968 reflects a change in socket and bulb format that makes earlier and later bulbs physically incompatible with one another.