Oldsmobile Custom Cruiser Map Light Bulb Size

The Oldsmobile Custom Cruiser Map Light utilizes bulb sizes 194, 561, and 1004 depending on the specific production period. Data for the lighting components spans from 1971 through 1992.

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
1991-1992	194
1990	561
1980-1989	1004
1974-1978	1004
1971	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
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 1004 bulb is the most frequently specified map light bulb across the Oldsmobile Custom Cruiser lineup, covering model years 1974-1982, 1983-1989 (with 1980 included), and extending back to 1974-1978.
The 1004 is a dual-filament bulb rated at 12V with a 21/5W output, mounted via a BAY15d bayonet base, and is classified as a variant of the more widely known 1157 bulb.
The BAY15d bayonet base on the 1004 features offset pins, which prevents incorrect installation by ensuring the bulb seats in only one orientation.
The 194 bulb is a miniature wedge type in the T10 form factor, rated at 12V and 3.78W, and is specified for the Oldsmobile Custom Cruiser in 1991-1992 as well as 1971.
The wedge base of the 194 bulb relies on the tension of its wire leads rather than a separate locking mechanism to hold it in the socket, which distinguishes it from bayonet-style bulbs like the 1004.
The 1990 Oldsmobile Custom Cruiser uses a 561 festoon bulb for the map light, a 44mm unit with end-cap contacts rated at 12V and 12W, making it distinct from every other model year in these specifications.
The 561 festoon bulb makes contact at both ends of its cylindrical body rather than through a base, requiring a holder that grips the bulb lengthwise.
Because the 194, 561, and 1004 each use a different base type, they are not interchangeable with one another without a socket adapter, even though all three operate at 12V.
The wattage difference between the 1004 (21/5W dual-filament) and the 194 (3.78W single-filament) reflects a significant gap in light output, which is relevant when considering socket and wiring compatibility during any bulb substitution.
All three bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada.