Isuzu NPR-HD Back Up Light Bulb Size

The Isuzu NPR-HD back up light requires a bulb size of 1156 for the rear exterior lighting system. Data provided for the bulb specifications covers the range from 1999 through 2013.

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
1999-2013	1156 (Tilt Cab)

Bulb Specifications

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

Other Locations

Additional Notes

The back up light bulb for the Isuzu NPR-HD is the 1156 across all listed model years, spanning 1999-2013.
All entries in the specifications carry a Tilt Cab designation, indicating this fitment applies specifically to that cab configuration.
The 1156 is an ANSI-standardized bulb type recognized in both the United States and Canada.
It operates on a 12-volt electrical system and draws 21 watts, which is typical for incandescent reverse light applications.
The 1156 uses a BA15s bayonet base, which is a single-contact bayonet mount with a 15mm collar.
Because the 1156 is single-filament, it serves only one lighting function per socket, unlike dual-filament variants such as the 1157 that handle two functions from a single housing.
The BA15s base of the 1156 is not interchangeable with the BA15d base found on dual-contact bulbs; the pin alignment differs, preventing incorrect installation in most sockets.