Jeep J-2500 Back Up Light Bulb Size

The Jeep J-2500 back up light bulb size specifications include 1156 and 1073 bulb options for this vehicle model. The replacement chart covers 1965 through 1973 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
1972-1973	1156
1968	1073
1965-1967	1156

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 bulb is the most frequently specified back up light bulb across the Jeep J-2500 model years covered, appearing in five of the six listed years: 1965-1967 and 1972-1973.
The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, which is a single-contact base with a 15mm collar.
The 1073 bulb is specified for the Jeep J-2500 in 1968 only, making it the less common of the two bulb types in these specifications.
The 1073 shares the same ANSI-standard single-filament design and BA15s bayonet base as the 1156, but operates at a lower wattage of 13W versus 21W at the same 12V supply.
Because the 1073 and 1156 share the same BA15s bayonet base, they are physically interchangeable in terms of socket fitment, though their wattage ratings differ.
The wattage difference between the two bulb types means that substituting a 1156 for a 1073, or vice versa, would alter the light output of the back up lamp, as higher wattage in an incandescent bulb generally produces greater luminous output.
Both bulb types conform to ANSI standards applicable in the United States and Canada, indicating they meet a defined set of dimensional and electrical performance criteria for those markets.