The Cadillac Eldorado side marker requires a 194 bulb size for the specific lighting component located on the exterior of the vehicle. Data for the bulb specifications covers the range from 1999 to 2002.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 194 bulb is the most widely used type across the Cadillac Eldorado's side marker specifications, appearing in both front and rear positions across the majority of model years covered.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W, conforming to ANSI standards for the US and Canadian markets.
The 194NA shares the same T10 wedge form, voltage, and wattage as the standard 194 but incorporates natural amber glass, which produces a colored output without a separate amber lens.
The Cadillac Eldorado front side marker uses the 194NA for model years 1974-1979, 1983, and 1985-1989, meaning the amber tint is built into the bulb itself for those fitments.
From 1990-2002, the Eldorado front side marker transitions to the clear 194, indicating those assemblies rely on the lens rather than the bulb for any amber coloring.
The 168 is also a T10 miniature wedge bulb rated at 12V but draws 4.9W, making it a higher-wattage alternative to the 194 despite sharing the same base type.
Because the 168 and 194 share a T10 wedge base, they are physically interchangeable in terms of socket fit, but their wattage ratings differ and substituting one for the other may affect circuit load and light output.
The rear side marker on the Eldorado uses the 168 for 1972-1973, 1975-1976, and the 194 for most other years, so confirming the exact model year is necessary before selecting a replacement.
The 1990-1991 Eldorado rear side marker uses the bulb size 24, a single-filament bulb with a BA9s bayonet base rated at 12V and 2W, which is physically incompatible with the T10 wedge socket used in surrounding model years.
The BA9s base on the size 24 bulb is a pin-type bayonet fitting, making it a distinct socket type from the wedge-based 194 and 168 bulbs and requiring a different housing to accommodate it.