The Geo Tracker front and rear side marker bulbs both utilize a 194 size bulb for optimal illumination. The replacement chart covers 1989 through 1997 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 Geo Tracker uses the 194 bulb for its front side marker across the entire 1989-1997 model range.
The 194 bulb is an ANSI-standardized type recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared across manufacturers.
The 194 is a T10 miniature wedge bulb, a form factor that uses the tapered plastic base of the bulb itself as the electrical contact, with no separate metal pins or screw threads.
The 194 bulb operates at 12 volts and draws 3.78 watts, placing it in the low-wattage category typical of marker and courtesy lighting applications.
The rear side marker position on the Geo Tracker also uses the 194 bulb, covering the 1989-1991 model years.
Because the front and rear side marker positions share the same 194 bulb specification, a single bulb type serves both locations on models where both positions are listed.
The T10 wedge format of the 194 is a widely cross-referenced size, and numerous manufacturer part numbers from different brands correspond to the same ANSI 194 designation, which is relevant when sourcing replacements.
The 194 designation is an ANSI trade number, meaning the electrical and physical characteristics it defines are standardized rather than proprietary to any single bulb manufacturer.