Oldsmobile Starfire Map Light Bulb Size

The Oldsmobile Starfire map light requires bulb size 90 or 1004 depending on the specific application for the interior lighting component. Data for the bulb sizes covers the range from 1962 through 1976.

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
1976	1004
1962-1966	90

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, 13W.	90

Other Locations

Additional Notes

The Oldsmobile Starfire map light specifications cover model years 1962-1966 and 1976, with two distinct bulb types appearing across those years.
The bulb 90 is an ANSI-standard single-filament type rated at 12V and 13W, fitted with a BA15s bayonet base, and it serves as the map light bulb for the Oldsmobile Starfire across the 1962-1966 model years.
The BA15s bayonet base on the 90 bulb features a single contact pin, which is a defining characteristic that distinguishes it from dual-contact bayonet bases used in other bulb types.
The 1976 Oldsmobile Starfire map light uses the 1004 bulb, a departure from the 90 bulb used in earlier model years.
The 1004 is an ANSI-standard dual-filament bulb rated at 12V and 21/5W, mounted on a BAY15d bayonet base, which offsets its two contact pins to prevent incorrect installation.
The 1004 is a variant of the 1157 bulb, meaning the two share a close relationship in design, though they are not confirmed as interchangeable in these specifications.
The single-filament 90 bulb and the dual-filament 1004 bulb use different bayonet base types, BA15s and BAY15d respectively, making them physically incompatible with each other's sockets.
The wattage difference between the two bulb types is notable, as the 90 operates at a fixed 13W while the 1004 operates at either 21W or 5W depending on which filament is active.