Ford Consul Back Up Light Bulb Size

The Ford Consul back up light requires bulb size 1141 or 1129 depending on the specific version of the component installed in the vehicle. Data for the bulb specifications covers the range from 1953 through 1957.

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
1956-1957	1141
1953-1955	1129

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1141
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1129

Other Locations

Additional Notes

The Ford Consul back up light specifications cover model years 1953-1957, with two distinct bulb types used across that span.
The 1141 bulb is an ANSI-standard single-filament type rated at 12V and 21W, fitted with a BA15s bayonet base, and it appears in the 1956-1957 Ford Consul.
The BA15s base is a single-contact bayonet fitting, meaning it is not interchangeable with dual-contact bayonet bases without modification.
The 1129 bulb is an ANSI-standard dual-filament type rated at 12V with a 21/5W output split across its two filaments, fitted with a BAY15d bayonet base, and it is specified for the 1953-1955 Ford Consul.
The BAY15d base features offset pins that prevent incorrect installation of a single-filament bulb in a socket designed for dual-filament operation.
The 1129 is noted as a variant of the 1157, sharing the same BAY15d base and dual-filament configuration, though wattage ratings between variants may differ slightly.
Because the 1141 uses a BA15s base and the 1129 uses a BAY15d base, the two bulb types are not physically interchangeable despite both operating at 12V.
The shift from the dual-filament 1129 to the single-filament 1141 between the 1955 and 1956 model years reflects a change in the back up light socket design on the Ford Consul.