American Motors Javelin Map Light Bulb Size

The American Motors Javelin map light requires bulb size 1004 or 194 depending on the specific application. Data for the bulb sizes covers the range from 1968 to 1971.

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
1971	194
1968-1969	1004

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
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 Javelin map light uses two distinct bulb types across its model years: the 194 for the 1971 model year and the 1004 for the 1968-1969 model years.
The 194 is a miniature wedge bulb of the T10 form factor, operating at 12V with a power draw of 3.78W, and it follows the ANSI standard applicable in both the US and Canada.
The T10 wedge base of the 194 requires no locking mechanism, as the wedge-shaped base itself holds the bulb in place within the socket.
The 1004 is a dual-filament bulb fitted with a BAY15d bayonet base, operating at 12V with a power rating of 21/5W, reflecting its two separate filaments drawing different wattages.
The BAY15d bayonet base of the 1004 features offset pins, which prevent incorrect insertion and ensure proper filament alignment within the socket.
The 1004 is noted as a variant of the 1157, meaning the two share a close relationship in design, though they are not confirmed as direct substitutes for this application without further verification.
The dual-filament construction of the 1004 is a notable characteristic for a map light application, as map light circuits typically engage only a single filament.
Both the 194 and the 1004 conform to ANSI standards recognized in the US and Canada, indicating standardized electrical and physical specifications for each type.
The wedge base of the 194 and the bayonet base of the 1004 are physically incompatible socket types, meaning the 1971 and 1968-1969 Javelin map light sockets are not interchangeable with one another.