Mercury Meteor Dome Light Bulb Size

The Mercury Meteor dome light requires a 1003 bulb size for proper installation within the interior overhead housing. Data for the specified lighting component covers the period from 1961 through 1963.

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
1961-1963	1003

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1003

Other Locations

Additional Notes

The 1003 is an ANSI-standardized bulb used across the North American market, operating at 12 volts and 21 watts with a single filament.
The BA15s designation refers to a single-contact bayonet base with a 15mm collar, which is not interchangeable with the BA15d double-contact variant despite their similar physical appearance.
The Mercury Meteor uses the 1003 bulb for its dome light across the 1961-1963 model years.
A single-filament construction means the 1003 serves one lighting function only, as opposed to dual-filament bulbs that can serve two independent functions such as stop and tail within a single housing.