Dodge Sierra Back Up Light Bulb Size

The Dodge Sierra back up light uses 1156, 1073, or 1129 bulb sizes depending on the specific model variant. The replacement chart covers vehicle production years spanning 1954 to 1959 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
1958-1959	1156
1956-1957	1073
1954-1955	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 Dodge Sierra back up light specifications span model years 1954 through 1959, covering three distinct bulb types across that range.
The 1156 bulb is a single-filament unit rated at 12V and 21W, fitted with a BA15s bayonet base, and conforms to ANSI standards applicable in both the United States and Canada. It serves the 1958-1959 Dodge Sierra.
The BA15s bayonet base features a single locating pin, which means it accepts insertion in any rotational orientation and is not interchangeable with dual-pin bayonet bases.
The 1073 bulb shares the same BA15s bayonet base and 12V operating voltage as the 1156 but draws only 13W, making it a lower-wattage variant of that bulb. It is fitted to the 1956-1957 Dodge Sierra.
Although the 1073 and 1156 share the same base type, their wattage difference means one is not a direct substitute for the other without accounting for the change in light output.
The 1129 bulb, used on the 1954-1955 Dodge Sierra, is a dual-filament unit rated at 12V with a 21/5W output, and it uses a BAY15d bayonet base.
The BAY15d base carries two offset locating pins, a design that prevents incorrect installation by ensuring the bulb seats in only one orientation, aligning each filament to its intended circuit.
The 1129 is described as a variant of the 1157 bulb and shares its dual-filament configuration, though the two are not confirmed as interchangeable within these specifications.
The shift from the dual-filament 1129 in 1954-1955 to the single-filament 1073 in 1956-1957 also represents a change in base type, from BAY15d to BA15s, making those bulbs physically incompatible with each other's sockets.