The Isuzu Stylus uses a 9004 bulb size for both high beam and low beam headlight applications. Replacement specifications in the chart cover 1991 to 1993 model years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9004 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments to produce both high and low beam output from one unit.
The Isuzu Stylus uses the 9004 bulb for both high beam and low beam headlights across the 1991-1993 model years.
Because the 9004 serves both beam functions in this application, the high and low beam positions draw from the same physical bulb rather than separate units.
The 9004 operates on a 12-volt system and carries a dual wattage rating of 65W for high beam and 45W for low beam, reflecting the different power draw of each filament.
The 9004 uses a P29t base, which is a specific bayonet-style connector that is not interchangeable with other common base types such as the H4's P43t base, despite the H4 also being a dual-filament halogen bulb.
The 9004 conforms to ANSI standards and is approved for use in the United States and Canada, indicating it meets the photometric and safety requirements established for those markets.