Isuzu Rodeo Back Up Light Bulb Size

The Isuzu Rodeo back up light utilizes 1073, 1156, and P21W bulb sizes for the rear illumination system. Data for the specified vehicle covers the range from 1991 through 2004.

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
1992-2004	1156
1991	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 Isuzu Rodeo backup light uses the 1156 bulb across the 1992-2004 model years, making it the dominant fitment across nearly the full production span covered by these specifications.
The 1156 is a single-filament bulb rated at 12 volts and 21 watts, built on a BA15s bayonet base, and recognized under ANSI standards in both the United States and Canada.
The BA15s bayonet base features a single contact pin, which corresponds directly to the single-filament design of the 1156 and distinguishes it from dual-filament bayonet types used in other automotive applications.
The 1991 Isuzu Rodeo departs from the later fitment, specifying the 1073 bulb instead of the 1156.
The 1073 shares the same BA15s bayonet base and 12-volt single-filament construction as the 1156, but operates at 13 watts rather than 21 watts, making it a lower-output variant within the same bulb family.
Because the 1073 and 1156 share the same BA15s base, they are physically interchangeable in terms of socket fit, though their wattage ratings differ and this distinction is relevant to the 1991 model year fitment.
Both bulb types conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and mechanical tolerances across manufacturers.