Chevrolet C-Series Pickup Turn Signal Indicator Bulb Size

Additional Notes

• The Chevrolet C-Series Pickup turn signal indicator position uses three distinct bulb sizes across the listed model years: the 74, 194, and 168, all of which conform to ANSI standards recognized in both the United States and Canada.
• All three bulb types are miniature wedge-base designs, meaning they use a wedge-shaped plastic base rather than a metal pin or bayonet fitting to secure the bulb within its socket.
• The 194 is a T10 wedge bulb rated at 12V and 3.78W, and it is the most frequently specified size across the listed data, covering model years 1988-1998.
• The 168 is also a T10 wedge bulb and shares the same 12V operating voltage as the 194, but draws more power at 4.9W. It is specified for the 1985-1986 model years.
• Although the 194 and 168 share the same T10 wedge form factor, their wattage ratings differ. Direct substitution between these two types may affect circuit load and indicator brightness.
• The 74 is a T5 wedge bulb rated at 12V and 1.4W, representing the lowest wattage among the three types. It is specified for the Chevrolet C-Series Pickup for the 1999-2000 model years.
• The T5 and T10 designations refer to the tubular envelope width of the bulb, with T5 being narrower than T10. These two form factors are physically incompatible with each other's sockets.
• A change in specified bulb size occurs at the 1999 model year, where the application shifts from the T10-based 194 to the physically smaller T5-based 74, indicating a socket change that makes earlier and later bulbs non-interchangeable.