Chevrolet Cavalier Turn Signal Indicator Bulb Size

Additional Notes

• The turn signal indicator bulb specifications for the Chevrolet Cavalier span model years 1982 through 2002, with three distinct bulb types used across that period: PC74, 161, and 194.
• The 194 bulb is the most frequently specified type, covering model years 1982-1993. It is an ANSI-standard miniature wedge bulb in a T10 form factor, rated at 12V and 3.78W.
• The PC74 bulb is specified for the 2000-2002 Cavalier. It is an ANSI-standard miniature wedge bulb in a T5 form factor, rated at 12V and 1.4W, and uses a printed circuit board twist-lock socket designed for instrument cluster applications.
• The 161 bulb is specified exclusively for the 1994 model year. It shares the T10 form factor and 12V operating voltage with the 194 but is rated at a lower 1W output compared to the 194's 3.78W.
• Although the 161 and 194 bulbs share the same T10 wedge form factor, their wattage ratings differ significantly. The 194 draws nearly four times the power of the 161, which affects brightness output and may affect compatibility with the original socket and circuit design of a given model year.
• The PC74's twist-lock socket mechanism is physically distinct from the standard wedge base of the 161 and 194 bulbs, making the PC74 non-interchangeable with either of those types regardless of voltage compatibility.
• All three bulb types conform to ANSI standards applicable in both the United States and Canada, indicating standardized electrical and physical tolerances across the North American market.
• The T5 designation of the PC74 refers to a tubular bulb with a nominal width of 5/8 inch, while the T10 designation of the 161 and 194 refers to a tubular bulb with a nominal width of 10/8 inch (1.25 inches), reflecting a physically larger envelope.