The Geo Tracker high beam and low beam headlight bulbs both utilize a 9004 size. The replacement chart covers vehicle production spanning 1989 to 1997.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Geo Tracker uses the 9004 bulb for both the high beam and low beam headlight positions across all model years from 1989-1997.
The 9004 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments to serve both the high beam and low beam functions within one housing.
The 9004 operates on a 12-volt electrical system and draws 65 watts on the high beam filament and 45 watts on the low beam filament.
The 9004 bulb uses a P29t base, which is a specific bayonet-style connector that physically locks the bulb into the headlight socket and is not interchangeable with other base types.
The 9004 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a defined set of performance and dimensional specifications shared across manufacturers.
Because the same 9004 bulb size is specified for both the high beam and low beam positions on the Geo Tracker (1989-1997), only one bulb type is required per headlight assembly rather than separate bulbs for each function.