Dodge Lancer Back Up Light Bulb Size

The Dodge Lancer back up light requires bulb sizes 1129, 1073, 1156, or P21W depending on the specific version of the vehicle. Available data for the bulb sizes covers the range from 1955 through 1989.

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
1985-1989	1156
1961-1962	1156
1959	1156
1956-1957	1073
1955	1129

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	1073
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1129

Other Locations

Additional Notes

The 1156 bulb is the most frequently specified back up light bulb across the Dodge Lancer lineup, covering the 1985-1989 and 1961-1962 model years, as well as 1959.
The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, which features a single locating pin on the base collar.
The 1073 bulb was specified for the Dodge Lancer in 1956-1957 and shares the same BA15s bayonet base as the 1156 but operates at a lower wattage of 13W at 12V.
Because the 1073 and 1156 share the BA15s base, they are physically interchangeable in terms of socket fit, though their wattage ratings differ and substitution may affect circuit load.
The 1955 Dodge Lancer uses the 1129 bulb, which is a dual-filament type rated at 12V with a 21/5W output, meaning it carries one filament for a higher-intensity function and a second for a lower-intensity function.
The 1129 is fitted with a BAY15d bayonet base, which uses two offset locating pins to prevent incorrect installation. This base is not interchangeable with the BA15s base used by the 1156 and 1073.
The 1129 is described as a variant of the 1157, a widely recognized dual-filament automotive bulb, indicating a close relationship in design and base type between the two.
All three bulb types specified for the Dodge Lancer back up lights conform to ANSI standards applicable in the United States and Canada.