The Isuzu i-370 uses a 9005 bulb size for high beam headlights and a 9006 bulb size for low beam headlights. The replacement chart covers 2007 to 2008 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Isuzu i-370 uses the 9005 bulb for high beam headlights across both the 2007-2008 model years, and the 9006 bulb for low beam headlights across the same span.
Both the 9005 and 9006 are ANSI-standardized halogen bulb types recognized in the United States and Canada, each operating on a 12-volt electrical system.
The 9005 is a single-filament halogen bulb rated at 65 watts, meaning it draws more power and produces a brighter output suited to high beam use.
The 9006 is also a single-filament halogen bulb but is rated at 55 watts, reflecting the lower output typically associated with low beam applications.
Although the 9005 and 9006 share a similar physical profile, they use different base types. The 9005 uses a P20d base while the 9006 uses a P22d base, making the two bulbs non-interchangeable despite their visual resemblance.
The difference in base type between the 9005 and 9006 is a deliberate safety measure under ANSI standards, preventing a higher-wattage high beam bulb from being installed in a low beam socket.