Chevrolet Blazer Clock Light Bulb Size

The Chevrolet Blazer clock light requires a 168 bulb size for proper illumination of the internal time display component. Data for the specified lighting equipment covers the range from 1987 to 1991.

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
1987-1991	168

Bulb Specifications

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

Other Locations

Additional Notes

The 168 bulb is the sole clock light bulb type listed for the Chevrolet Blazer across the 1987-1991 model years.
The 168 bulb follows the ANSI standard, which is the American National Standards Institute classification system used to define bulb specifications for the United States and Canadian markets.
This bulb uses a T10 miniature wedge base, a base style that relies on the glass envelope itself being pressed into a wedge-shaped socket rather than using a metal pin or bayonet fitting.
The 168 operates at 12 volts and draws 4.9 watts, figures consistent with low-power interior illumination applications such as clock backlighting.
The T10 wedge form factor is shared by a number of other bulb types in the same family, which means physical fitment alone does not confirm electrical compatibility; voltage and wattage ratings require separate verification before substitution.