The Cadillac Brougham front side marker uses a 194 or 194NA bulb size, while the rear side marker requires either a 24 or 194 bulb size. The replacement chart covers vehicle production spanning 1987 to 1992.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Cadillac Brougham uses three bulb types across its front and rear side marker positions: the 194, the 194NA, and the 24.
The 194 and 194NA share identical electrical ratings of 12V and 3.78W, and both follow the T10 miniature wedge form factor under the ANSI standard applicable in the US and Canada.
The sole distinction between the 194 and 194NA is the natural amber-tinted glass envelope on the 194NA, which filters light color at the source rather than relying on a colored lens.
The 24 bulb carries a BA9s bayonet-style base and operates at 12V with a lower 2W output, making it electrically and physically incompatible with the T10 wedge sockets used elsewhere on the same vehicle.
The front side marker position on the Cadillac Brougham used the 194NA for model years 1987-1989 and transitioned to the standard 194 for 1990-1992.
The rear side marker position followed the opposite pattern, using the 194 for 1987-1989 and switching to the 24 for 1990-1992.
Because the 194NA and 194 share the same T10 wedge base and wattage, a 194NA can physically seat in a 194 socket, though the amber tint of the 194NA would alter the emitted light color if substituted into a position designed for a clear bulb.
The 24 bulb's BA9s base is a single-contact bayonet fitting, which requires a dedicated socket type and is not interchangeable with the wedge-base sockets used by the 194 or 194NA.