Isuzu Oasis Back Up Light Bulb Size

The Isuzu Oasis back up light requires a 7440 bulb size for proper installation and function. Data for the specific component covers the period from 1996 to 1999.

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
1996-1999	7440

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440

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Additional Notes

The Isuzu Oasis uses the 7440 bulb for the back up light across all listed model years, spanning 1996-1999.
The 7440 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
This bulb belongs to the T20 wedge family, a form factor defined by its wedge-shaped base, which connects directly into a matching socket without a separate metal cap or pins.
The 7440 operates on a 12-volt electrical system, consistent with the standard automotive DC voltage found in passenger vehicles of this era.
At 21 watts, the 7440 produces a relatively high output for a single-filament wedge bulb, which is typical for reverse light applications that require adequate illumination behind the vehicle.
The single-filament design of the 7440 means it serves one lighting function only, distinguishing it from dual-filament variants such as the 7443, which would not be a direct drop-in replacement despite sharing the same T20 socket housing.