Jeep J-3500 Back Up Light Bulb Size

The Jeep J-3500 back up light bulb size specifications include 1156 and 1073 bulb options for this vehicle model. The replacement chart covers 1965 to 1968 production years with corresponding bulb size data.

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
1968	1156
1965-1967	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 Jeep J-3500 backup light specifications cover model years 1965 through 1968, with two distinct bulb types used across that span.
The 1156 bulb is specified for the 1968 model year. It is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The 1073 bulb is specified for the 1965-1967 model years. It is also an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V and 13W.
Both bulb types conform to ANSI standards recognized in the United States and Canada.
The BA15s bayonet base is a single-contact base type. The "s" in BA15s denotes a single contact point at the base, which distinguishes it from the dual-contact BA15d variant.
Although the 1156 and 1073 share the same BA15s bayonet base, they are not interchangeable without consequence. The 1156 draws 21W while the 1073 draws 13W, a difference that affects circuit load and output brightness.
Substituting a 1156 into a socket designed for a 1073 would place a higher wattage draw on the circuit than originally specified for the 1965-1967 Jeep J-3500.
The single-filament construction of both bulbs is consistent with a backup light application, which requires only one steady-on function rather than a dual-function switching arrangement.