Dodge Aspen Back Up Light Bulb Size

The Dodge Aspen back up light bulb uses either 1141 or 1156 size bulbs depending on the specific vehicle configuration. The replacement chart covers 1976 through 1980 production years with corresponding bulb size specifications.

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
1980	1141
1976-1979	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1141
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The 1156 bulb is the back up light specification for the Dodge Aspen across the 1976-1979 model years, making it the predominant fitment across the production run covered by these specifications.
The 1980 Dodge Aspen departs from the 1156 specification, with the 1141 bulb listed instead as the back up light fitment.
Both the 1141 and 1156 are ANSI-standardized bulb types recognized in the United States and Canada.
Each bulb type operates at 12 volts with a 21-watt output, meaning both draw the same power and produce the same nominal light output.
Both bulbs use a single filament, which is the standard construction for back up lights, as these circuits require only one brightness level with no dimming function.
The BA15s bayonet base is shared by both the 1141 and 1156, referring to a single-contact bayonet fitting with a 15mm base width, which is a widely used automotive socket type.
Despite sharing the same voltage, wattage, base type, and filament count, the 1141 and 1156 are distinct part numbers and are not listed as interchangeable within these specifications.