Chevrolet Caprice Radio Display Bulb Size

Additional Notes

• The Chevrolet Caprice radio display bulb specifications span from 1966 to 1992, covering five distinct ANSI-standard bulb sizes across that period.
• The 1893 bulb is the most frequently specified across the listed years, appearing in the 1966-1971, 1978, and 1981-1982 model years. It is a T5 miniature wedge bulb rated at 12V and 2W.
• The 1816 bulb is the second most common, specified for the 1972-1977 model years. It is a T3.25 miniature wedge bulb rated at 12V and 4W, making it the highest-wattage bulb in these specifications.
• The 194 bulb appears in the 1979-1980 and 1983-1985 model years. It is a T10 miniature wedge bulb rated at 12V and 3.78W, and it is physically larger than the T5 bulbs used in other years.
• The T5 envelope size is shared by three different bulb numbers in these specifications: the 37 (1W), the 73 (1.4W), and the 1893 (2W). Despite sharing the same envelope designation, these bulbs differ in wattage and are not interchangeable.
• The 37 bulb is specified for the 1990-1992 Chevrolet Caprice radio display. At 1W, it is the lowest-wattage bulb across all listed years.
• The 73 bulb is specified exclusively for the 1986 model year. It shares the T5 form factor with the 37 and 1893 bulbs but draws 1.4W, placing it between those two in power consumption.
• All five bulb types in these specifications conform to ANSI standards recognized in both the United States and Canada, indicating standardized electrical and physical ratings across the range.
• The T5 and T3.25 designations refer to the tubular glass envelope width, measured in eighths of an inch. A T5 envelope is 5/8 inch wide, while a T3.25 envelope is narrower at approximately 3.25/8 inch wide.
• Because the 1893, 37, and 73 bulbs all use a T5 envelope, physical fitment alone is not a reliable guide to correct replacement; wattage ratings must also match the original specification for the applicable model year.