Ford Falcon Back Up Light Bulb Size

The Ford Falcon back up light utilizes 1156 and P21W bulb sizes for the rear illumination system. Data for the specified components covers the period from 1962 through 1970.

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
1962-1970	1156

Bulb Specifications

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

Other Locations

Additional Notes

The Ford Falcon uses the 1156 bulb for the back up light across all specified model years, from 1962 to 1970.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are defined by a recognized North American standard shared across the United States and Canada.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is consistent with standard automotive reverse lighting applications of that era.
The 1156 uses a BA15s bayonet base, a single-contact mount where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d variant used in other bulb types.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, which in this context is the back up light.
Because the BA15s base is a single-contact design, it is not interchangeable with visually similar bayonet-base bulbs that carry two contacts, such as the 1157, despite the similar base size.