Jeep Gladiator Back Up Light Bulb Size

Jeep Gladiator back up light bulb sizes include 7440, 1156, and 1073 specifications for the replacement bulb. The chart covers vehicle production years spanning 1962 to 2020 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
2020	7440 (For Vehicle With Incandescent Lamp)
1968	1156
1967	1073
1962-1966	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440
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 size across the Jeep Gladiator backup light fitments, appearing in model years 1962-1966 and 1968.
The 1156 is an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V and 21W.
The BA15s bayonet base uses a single contact pin, which physically distinguishes it from dual-contact bayonet bases and makes it non-interchangeable with those variants.
The 1073 bulb, specified for the 1967 Gladiator, shares the same BA15s bayonet base as the 1156 but operates at a lower wattage of 13W versus 21W, making the two bulbs physically similar yet electrically distinct.
Because the 1073 and 1156 share the same base type, one may physically seat in the other's socket, though the difference in wattage means they are not rated equivalents and substitution affects light output.
The 2020 Jeep Gladiator uses the 7440 bulb, specified for vehicles equipped with an incandescent lamp, indicating that not all 2020 Gladiators use this fitment.
The 7440 is an ANSI-standard single-filament wedge bulb in the T20 form factor, rated at 12V and 21W, and its wedge base design is mechanically incompatible with the BA15s bayonet sockets used in earlier Gladiator model years.
Both the 7440 and the 1156 share a 12V, 21W electrical rating despite having entirely different base types, so they are not interchangeable regardless of matching wattage.