Edsel Corsair Dome Light Bulb Size

The Edsel Corsair dome light requires a 1003 bulb size for the interior illumination system. Available data for 1003 bulbs covers the specific range from 1958 to 1959.

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
1958-1959	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 bulb is the specified dome light bulb for the Edsel Corsair across both available model years, 1958-1959.
The 1003 is an ANSI-standardized bulb type recognized in the United States and Canada.
It operates on a 12-volt electrical system, consistent with the 12V automotive standard that became widespread in American vehicles during the 1950s.
The 1003 carries a 21-watt rating, which places it in the mid-range of incandescent automotive interior bulbs.
The bulb uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin rather than the dual-pin BA15d variant.
The 1003 is a single-filament bulb, meaning it serves one lighting function only, with no secondary filament for a reduced-brightness mode.
The BA15s base type is a common fitment in automotive interior applications, and any replacement bulb must match this base configuration to seat correctly in the socket.