Chevrolet C-Series Pickup Radio Display Bulb Size

Chevrolet C-Series Pickup radio display bulb size 1893 specifications are documented in this reference. The replacement chart covers vehicle production years from 1985 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
1988-1991	1893
1985-1986	1893

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W.	1893

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Additional Notes

The 1893 is the sole radio display bulb type specified for the Chevrolet C-Series Pickup across the listed model years.
The 1893 bulb follows the ANSI standard recognized in both the United States and Canada, placing it within a regulated and widely distributed bulb classification.
It is a T5 miniature wedge bulb, a form factor defined by a wedge-shaped base that seats directly into a socket without a separate metal cap or bayonet pin.
The T5 designation refers to a tubular envelope with a width of five-eighths of an inch, which is a standard sizing convention in miniature automotive and instrument lighting.
The 1893 operates at 12 volts and 2 watts, reflecting the low-power demands typical of instrument panel and radio display illumination circuits.
The 1893 bulb is specified for the Chevrolet C-Series Pickup across the 1985-1986 and 1988-1991 model years, representing consistent fitment across that production span.
The wedge base design of the 1893 means fitment is determined by socket slot width and depth, so substituting a bulb with a different base type would be physically incompatible regardless of matching voltage and wattage ratings.