Isuzu NPR Back Up Light Bulb Size

The Isuzu NPR back up light utilizes a single 1156 bulb size for the specific lighting component located at the rear of the vehicle. Available data covers a continuous range from 1986 through 2013 for the specified automotive application.

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
2002-2013	1156 (Tilt Cab)
1996-2001	1156
1986-1995	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 NPR back up light bulb specification calls for the 1156 bulb across all listed model years, spanning 1986 to 2013.
The 1156 is a single-filament bulb rated at 12 volts and 21 watts, making it suited for switched lighting functions such as reverse lights that require full brightness without variable intensity.
The 1156 uses a BA15s bayonet base, which features a single locating pin on the side of the base, distinguishing it from the dual-pin BA15d base used on two-filament bulbs.
The 1156 conforms to ANSI standards recognized in both the United States and Canada, reflecting its standardized status in North American automotive applications.
For the 2002-2013 model years, the Tilt Cab configuration is specified, indicating this body style is the applicable fitment context for the 1156 bulb during that period.
The 1996-2001 model years carry no sub-model designation in the specifications, appearing without a Tilt Cab or Heavy Duty qualifier.
The 1986-1995 model years are designated as Heavy Duty, representing the applicable configuration for the 1156 bulb specification during that earlier production period.
Because the BA15s base accepts only single-filament bulbs, substituting a dual-filament bulb with a BA15d base is not mechanically compatible with the NPR's back up light socket.
The 1156 is sometimes cross-referenced with the P21W designation in international markets, though the specifications here reference the ANSI 1156 classification applicable to North American fitment.
At 21 watts on a 12-volt circuit, the 1156 draws approximately 1.75 amperes, a load characteristic relevant when assessing socket and wiring compatibility during bulb replacement.