Mercury Caliente License Plate Bulb Size

The Mercury Caliente license plate light requires a bulb size of 1155 for the specific lighting components. Data for the bulb specifications covers the range from 1964 to 1967.

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
1964-1967	1155

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	1155

Other Locations

Additional Notes

The Mercury Caliente uses the 1155 bulb for the license plate position across the 1964-1967 model years.
The 1155 is an ANSI-standardized bulb recognized in both the United States and Canada.
It operates on a 12-volt electrical system and draws 21 watts, which is typical for incandescent automotive lighting of that era.
The 1155 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin rather than the dual-pin BA15d configuration.
The 1155 is a single-filament bulb, meaning it serves one lighting function rather than switching between two brightness levels.
The 1155 is a variant of the 1156, and while the two share a similar form factor, they are not confirmed as interchangeable for this application without independent verification of their electrical compatibility.