Plymouth Belvedere Map Light Bulb Size

The Plymouth Belvedere map light utilizes bulb sizes 90, 1004, and 1895 depending on the specific application and internal component requirements for the vehicle lighting system. Data for the specified automotive lighting components covers the historical production range from 1956 through 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	1895
1963-1970	90
1960-1962	1004
1956-1957	90

Bulb Specifications

Description	Bulb Size
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
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004

Other Locations

Additional Notes

The Plymouth Belvedere map light specifications cover model years 1956-1971, with three distinct bulb types used across that production span: the 90, 1004, and 1895.
The 90 bulb is the most frequently specified type across the Plymouth Belvedere map light fitments, appearing in the 1956-1957 and 1963-1970 model years.
The 90 bulb is an ANSI-standard single-filament unit rated at 12V and 13W, mounted via a BA15s bayonet base, which accepts a single pin and allows only one rotational position during installation.
The 1004 bulb is specified for the Plymouth Belvedere in the 1960-1962 model years and is a dual-filament unit with a BAY15d bayonet base, rated at 12V with a 21/5W output split between its two filaments.
The BAY15d base used by the 1004 features offset pins, which physically prevents it from being substituted with a BA15s-based bulb such as the 90, making the two types non-interchangeable despite both using bayonet-style bases.
The 1004 is noted as a variant of the 1157, a widely recognized automotive bulb, though the two are not identical and should not be treated as direct substitutes without confirming voltage and wattage compatibility.
The 1971 Plymouth Belvedere map light uses the 1895, a T5 miniature wedge bulb rated at 12V and 0.9W, which represents a significantly lower wattage output compared to the 90 and 1004 types used in earlier model years.
The wedge base of the 1895 is mechanically incompatible with the bayonet sockets required by the 90 and 1004 bulbs, meaning the 1971 model year socket configuration differs from those used in surrounding years.
The 1895 and 90 bulbs are both 12V units, but their wattage ratings differ substantially at 0.9W and 13W respectively, reflecting different luminous output levels and socket designs that prevent cross-fitment.
All three bulb types specified for the Plymouth Belvedere map light conform to ANSI standards applicable in both the United States and Canada.