Chevrolet C-Series Pickup Seat Belt Warning Bulb Size

Chevrolet C-Series Pickup seat belt warning bulb utilizes 74, 194, or 168 size specifications depending on model configuration. The replacement chart covers 1985 through 2000 vehicle production years with corresponding bulb size data.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1998-2000	74
1997	194
1996	74
1995	194
1994	74
1988-1993	194
1985-1986	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W.	74
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The seat belt warning bulb specifications for the Chevrolet C-Series Pickup span model years 1985-2000 and reference three distinct bulb sizes: 74, 194, and 168, all of which conform to ANSI standards recognized in both the United States and Canada.
The 194 bulb is the most frequently specified across this range, appearing in nine of the fifteen listed model years. It is a T10 miniature wedge bulb rated at 12V and 3.78W.
The 74 bulb, a T5 miniature wedge type rated at 12V and 1.4W, is specified for 1994, 1996, and 1998-2000. Its lower wattage reflects a physically smaller lamp envelope compared to the T10 variants.
The 168 bulb shares the T10 wedge form factor with the 194 but operates at a higher wattage of 4.9W. It is specified only for 1985-1986.
Although the 168 and 194 bulbs share the same T10 wedge base, their wattage ratings differ. Substituting one for the other in a seat belt warning circuit may affect indicator brightness or circuit load, and the specifications treat them as distinct fitments.
The T5 wedge base of the 74 bulb is physically smaller than the T10 base used by both the 194 and 168. This size difference makes the 74 mechanically incompatible with sockets designed for T10 bulbs, and vice versa.
The year 1997 is specified with a 194 bulb, while the immediately adjacent years 1996 and 1998 are specified with the 74 bulb, indicating that the seat belt warning socket fitment was not uniform across consecutive model years.