Chevrolet Chevette Radio Display Bulb Size

The Chevrolet Chevette radio display utilizes 194, 37, and 1893 bulb sizes for the internal illumination components. Data for the specific lighting requirements covers the 1976 to 1987 range.

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
1984-1987	194
1983	37
1979-1982	194
1978	1893
1976-1977	37

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1W.	37
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W.	1893

Other Locations

Additional Notes

The Chevrolet Chevette radio display bulb specifications cover model years 1976 through 1987 and reference three distinct ANSI-standard bulb types: the 194, the 37, and the 1893.
The 194 is the most frequently specified bulb across this range, appearing in nine of the twelve model years: 1979-1982 and 1984-1987. It is a T10 miniature wedge bulb rated at 12V and 3.78W.
The T10 designation for the 194 bulb refers to a tubular glass envelope that is 10 eighths of an inch wide, a standard sizing convention used in miniature automotive lighting.
The 37 bulb is specified for the Chevrolet Chevette in 1976, 1977, and 1983. It is a T5 miniature wedge bulb rated at 12V and 1W, making it the lowest-wattage type listed in these specifications.
The 1893 bulb is specified exclusively for the 1978 model year. It shares the T5 form factor and 12V rating with the 37 but draws 2W, placing it between the 37 and the 194 in power consumption.
Although the 37 and 1893 bulbs share the same T5 form factor, their wattage ratings differ. The 37 draws 1W while the 1893 draws 2W, and the two are not electrically interchangeable despite their physical similarity.
The 194 and the 37 or 1893 bulbs are not interchangeable. The 194 uses a T10 wedge base while the 37 and 1893 use the smaller T5 wedge base, meaning the socket size differs between these groups.
All three bulb types listed carry ANSI standardization for both the United States and Canada, indicating that the part numbers correspond to a shared North American specification rather than a manufacturer-specific designation.