American Motors American Dome Light Bulb Size

The American Motors American dome light utilizes bulb size 1004 or 1003 depending on the specific version of the vehicle. Data for the lighting components covers the range from 1958 to 1968.

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
1960-1968	1004
1958-1959	1003

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1003

Other Locations

Additional Notes

The American Motors American uses the 1004 bulb for the dome light across the 1960-1968 model years, while the 1958-1959 model years use the 1003 bulb instead.
Both the 1004 and 1003 are ANSI-standardized bulb types used in the United States and Canada.
The 1004 is a dual-filament bulb rated at 12V and 21/5W, meaning it operates two separate filaments at different wattages within a single housing.
The 1004 uses a BAY15d bayonet base, which is an offset twin-pin fitting designed to prevent incorrect insertion by positioning its two pins at different heights.
The 1004 is a variant of the 1157, a widely used automotive bulb type, though specific electrical or physical differences between the two variants apply and should be noted before substitution.
The 1003 is a single-filament bulb rated at 12V and 21W, drawing its full wattage through one filament rather than switching between two.
The 1003 uses a BA15s bayonet base, which is a single-pin fitting and is not interchangeable with the BAY15d base found on the 1004.
Because the 1003 and 1004 use different base types, a 1003 bulb cannot serve as a direct replacement in a socket designed for the 1004, and vice versa.