Oldsmobile Delta 88 Map Light Bulb Size

The Oldsmobile Delta 88 Map Light utilizes unique bulb sizes 906, 562, 561, 1004, 194, 1895, and 90 depending on the specific version. Available data covers the range from 1965 to 1991.

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	906
1988-1990	562
1987	561
1986	562
1980-1985	1004
1974-1978	1004
1971	194
1967	1895
1965-1966	90

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	562
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
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 0.9W.	1895
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90

Other Locations

Additional Notes

The 1004 bulb is the most frequently specified map light bulb for the Oldsmobile Delta 88, covering model years 1974-1982 and 1983-1985, as well as 1976-1978, making it the dominant fitment across the vehicle's history in these specifications.
The 1004 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V and 21/5W, and is noted as a variant of the widely known 1157 bulb type.
The festoon-style 562 bulb is specified for the Delta 88 across 1986-1990, with the exception of 1987, which uses the closely related 561 instead.
The 561 and 562 are both 44mm festoon bulbs with end-cap contacts rated at 12V and 12W under the ANSI standard, making them nearly identical in physical and electrical terms, though they carry distinct part designations.
Because the 561 and 562 share the same length, voltage, and wattage, their interchangeability in practice is a matter that depends on the specific socket and contact design of the fixture rather than electrical compatibility alone.
The 1991 Delta 88 map light uses the 906, a T10 miniature wedge bulb rated at 12V and 8W, which differs in both base type and wattage from the festoon bulbs used in the preceding model years.
The 194, specified for the 1971 Delta 88, is also a T10 miniature wedge bulb but is rated at only 3.78W, making it significantly lower in output than the 906 despite sharing the same base form factor.
Because the 194 and 906 share a T10 wedge base, physical fitment between the two is possible, but their wattage difference of roughly 4W versus 8W means they are not electrically equivalent replacements for one another.
The 1967 Delta 88 uses the 1895, a T5 miniature wedge bulb rated at 12V and 0.9W, which is among the lowest-wattage bulbs in these specifications and is not interchangeable with the T10-based bulbs used in other model years.
The 1965-1966 Delta 88 map light is specified with the 90 bulb, a single-filament type with a BA15s bayonet base rated at 12V and 13W, a base style that is physically distinct from the wedge and festoon types found across the remaining model years.