Chevrolet Brookwood Automatic Transmission Indicator Bulb Size

The Chevrolet Brookwood automatic transmission indicator uses bulb sizes 1445, 194, 57, and 53. Data for the specific components covers the period from 1960 through 1972.

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
1972	1445
1969-1971	194
1961	57
1960	53

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W.	1445
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W.	57
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W.	53

Other Locations

Additional Notes

The automatic transmission indicator on the Chevrolet Brookwood used four distinct bulb types across its model years: the 1445, 194, 57, and 53, all of which conform to ANSI standards applicable in both the United States and Canada.
The 194 bulb is the most frequently specified type in these records, covering the 1969-1971 model years. It is a miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W, and uses a wedge base rather than a bayonet or screw fitting.
The 1445 and 53 bulbs share the same BA9s bayonet base and the same 12V, 2W electrical rating, yet they carry different ANSI designations. Despite these similarities, they are not listed as interchangeable within these specifications, and substituting one for the other without verification of physical and optical compatibility is not supported by the data provided.
The 57 bulb, specified for the 1961 model year, also uses a BA9s base but is rated at a lower 1W output compared to the 1445 and 53. This lower wattage reflects a reduced light output, which was the specified requirement for that year's transmission indicator position.
The BA9s base, shared by the 1445, 57, and 53 bulbs, is a miniature bayonet cap with a 9mm cap body. It is a common base type in low-wattage indicator applications and is distinct from the wedge base used by the 194.
The 1960 model year uses the 53 bulb, while the 1961 model year uses the 57. Although both share the BA9s base, their wattage ratings differ, with the 53 rated at 2W and the 57 at 1W, making them electrically non-equivalent despite their physical base compatibility.
The transition from the 194 bulb in 1969-1971 to the 1445 in 1972 represents a shift between two different base types, from a wedge fitting to a BA9s bayonet cap, meaning the socket design in the indicator housing also changed between those model years.
All bulbs listed across these model years operate on a 12V electrical system, which was the standard automotive voltage for these vehicles during the production period covered by the specifications.