Jeep F-134 Back Up Light Bulb Size

The Jeep F-134 back up light uses a 1156 or 1073 bulb size for this model. The replacement chart covers 1965 to 1966 vehicle 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
1966	1156
1965	1073

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

Other Locations

Additional Notes

The 1156 and 1073 are both ANSI-standardized bulb types recognized across the US and Canada.
Both bulb types use a BA15s bayonet base, which is a single-contact base with a 15mm collar and one locating pin to prevent rotational misalignment during installation.
Both bulbs operate at 12 volts, consistent with standard automotive electrical systems of that era.
The 1156 is rated at 21W, while the 1073 is rated at 13W, meaning the two bulbs draw different amounts of current despite sharing the same base type.
The shared BA15s base between the 1156 and 1073 means the two bulbs are physically interchangeable in the socket, though their wattage ratings differ.
The Jeep F-134 used the higher-wattage 1156 for the 1966 model year backup light and the lower-wattage 1073 for the 1965 model year, indicating a specification change between those two years.
Both bulbs are single-filament types, which is typical for backup lights since that function requires only a single on/off state with no variable intensity.
Substituting a 1156 in a socket designed for a 1073 would introduce a higher current draw, which may affect the vehicle's wiring or fuse ratings on the 1965 F-134.