Dodge Seneca Dome Light Bulb Size

The Dodge Seneca dome light requires a 1004 bulb size for proper illumination within the interior cabin area. Available data for the specified lighting component covers the period from 1960 through 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

Bulb Specifications

Description	Bulb Size
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 follows ANSI standards recognized in both the United States and Canada, operating at 12 volts with a dual-filament design rated at 21/5 watts.
The dual-filament construction of the 1004 means it contains two separate filaments within a single envelope, each producing a different light output level corresponding to the two wattage ratings.
The 1004 uses a BAY15d bayonet base, a two-pin mount where the pins are offset at different heights to ensure the bulb seats in only one orientation, preventing incorrect installation.
The Dodge Seneca dome light takes the 1004 bulb across the 1960-1961 model years.
The 1004 is noted as a variant of the 1157, meaning the two share a related design lineage, though they are not confirmed as direct substitutes and should not be treated as interchangeable without verification of electrical and physical compatibility.