Plymouth Sport Wagon Map Light Bulb Size

Plymouth Sport Wagon map light bulb size 1004 represents the replacement bulb specification for this vehicle model. The chart covers 1960 to 1961 production years with corresponding bulb size data.

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 follows the ANSI standard recognized in both the United States and Canada, making it a regionally standardized component rather than a proprietary specification.
The 1004 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, each serving a distinct function at different wattages.
The bulb operates on a 12-volt electrical system and draws 21 watts on its primary filament and 5 watts on its secondary filament.
The 1004 uses a BAY15d bayonet base, which is an offset twin-pin mount. The offset pin placement is a deliberate design feature that prevents incorrect insertion orientation.
The 1004 is a variant of the 1157 bulb. While the two share the same BAY15d base type, they are not identical in electrical output, and substitution between them warrants attention to wattage compatibility with the vehicle's circuit.
The Plymouth Sport Wagon used the 1004 bulb for the map light position across the 1960-1961 model years.