American Motors AMX Dome Light Bulb Size

The American Motors AMX dome light requires bulb size 561 or 1004 depending on the specific application. Data for the bulb sizes covers the range from 1968 to 1980.

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
1978-1980	561
1970	561
1968-1969	1004

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004

Other Locations

Additional Notes

The American Motors AMX uses two distinct dome light bulb types across its model years: the 561 and the 1004, both conforming to ANSI standards applicable in the US and Canada.
The 561 is a festoon-style bulb, meaning it is cylindrical with flat end-cap contacts at each terminal rather than a base socket. It measures 44mm in length and operates at 12V with a 12W output.
The 1004 is a dual-filament bulb mounted on a BAY15d bayonet base, rated at 12V with a 21/5W output, indicating two separate wattage levels corresponding to its two filaments.
The 1004 is noted as a variant of the 1157, a widely recognized automotive bulb type, though the two are not identical and are not confirmed as interchangeable in this application.
The AMX (1978-1980) uses the 561 festoon bulb for the dome light. The 1970 model year also specifies the 561, making it the bulb associated with four of the six listed model years.
The AMX (1968-1969) uses the 1004 bulb for the dome light, which differs in both construction and electrical characteristics from the 561 used in later years.
Because the 561 and 1004 use fundamentally different mounting systems, a festoon end-cap versus a bayonet base, the two bulb types are not physically interchangeable without modification to the socket.
The dual-filament nature of the 1004 in a dome light application is atypical, as dome lights generally require only a single-filament bulb, which may reflect a socket shared with another lighting function in the 1968-1969 AMX.