Isuzu EVR Back Up Light Bulb Size

The Isuzu EVR back up light requires a 1156 bulb size for proper installation and function within the rear lighting assembly. Data for the specific component covers the range from 1987 to 1993.

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
1987-1993	1156 (Heavy Duty)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Isuzu EVR uses the 1156 bulb in the Heavy Duty variant for its back up light across the 1987-1993 model years.
The 1156 is a single-filament bulb, meaning it serves one lighting function rather than combining two, such as stop and tail, into a shared housing.
It operates on a 12-volt electrical system and draws 21 watts, which is typical for incandescent reverse lighting applications in commercial vehicles of that era.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and twisted to lock into place.
The BA15s base is not interchangeable with the BA15d base, which features two contact pins offset at different heights. Substituting one for the other is not possible without modification.
The 1156 is classified under the ANSI standard, making it a recognized specification in both the United States and Canada.
The Heavy Duty designation on the 1156 bulb indicates a construction built for greater vibration resistance and longer service life compared to a standard 1156, which is relevant given the commercial truck application of the Isuzu EVR.