Dodge Custom Map Light Bulb Size

The Dodge Custom map light requires bulb size 1004 or 90 depending on the specific vehicle configuration. Data for the bulb specifications covers the range from 1956 to 1961.

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
1960-1961	1004
1957-1959	90
1956	1004

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 Dodge Custom map light specifications cover model years 1956-1961, with two distinct bulb types used across this period: the 1004 and the 90.
The 1004 bulb is a dual-filament type rated at 12V and 21/5W, fitted with a BAY15d bayonet base, and is classified as an ANSI standard bulb for the US and Canadian markets.
The 90 bulb is a single-filament type rated at 12V and 13W, fitted with a BA15s bayonet base, and is likewise an ANSI standard bulb for the US and Canadian markets.
The BAY15d base of the 1004 and the BA15s base of the 90 are physically distinct bayonet fittings, meaning the two bulb types are not interchangeable despite both using bayonet-style bases.
The 1004 is described as a variant of the 1157, a widely recognized automotive bulb, though the two are not identical and substitution would require verification of fitment and wattage compatibility.
The Dodge Custom used the 1004 bulb for the 1956 model year, then transitioned to the 90 bulb for the 1957-1959 model years, before returning to the 1004 for the 1960-1961 model years.
The dual-filament nature of the 1004 means it carries two separate wattage ratings, 21W and 5W, each corresponding to a different filament, which is a characteristic relevant to correct socket wiring.