Dodge Seneca Map Light Bulb Size

The Dodge Seneca map light requires a 1004 bulb size for the interior lighting component. Data for the specified bulb covers the range from 1960 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

Bulb Specifications

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

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Additional Notes

The 1004 bulb is the map light bulb size for the Dodge Seneca across the 1960-1961 model years.
The 1004 is an ANSI-standardized bulb type recognized in both the United States and Canada.
The 1004 carries a dual-filament design, meaning it supports two separate levels of light output within a single bulb.
It uses a BAY15d bayonet base, a two-pin offset base that physically prevents incorrect insertion by positioning the pins at different heights.
The 1004 operates at 12 volts with a wattage rating of 21/5W, where each figure corresponds to one of the two filaments.
The 1004 is noted as a variant of the 1157, meaning the two types share fundamental design characteristics, though they are not confirmed as direct drop-in replacements for this application without verifying base and wattage compatibility.