Geo Tracker front turn signal bulbs utilize 1034NA or 1157NA sizes, while rear turn signal bulbs use 1156 or 1157 sizes. 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 front turn signal position on the Geo Tracker uses two distinct bulb types across its model years: the 1034NA for most years and the 1157NA for 1990 and 1993.
The 1034NA and 1157NA bulbs share the same BAY15d bayonet base, dual-filament design, 12V rating, and 21W/5W output, but both feature natural amber glass, which produces an amber signal color directly from the bulb rather than relying on a colored lens.
The 1034NA is a variant of the 1157, meaning it carries the same electrical and mechanical characteristics as the standard 1157 but with the addition of natural amber glass.
The rear turn signal position on the Geo Tracker uses the 1156 for 1992-1997 and the 1157 for 1989-1991.
The 1156 and 1157 bulbs are not interchangeable despite their similar appearance. The 1156 uses a BA15s single-contact bayonet base, while the 1157 uses a BAY15d dual-contact bayonet base, and the two bases are physically incompatible.
The rear turn signal position transitions from the dual-filament 1157 to the single-filament 1156 starting in 1992, reflecting a change in circuit design for that position.
All four bulb types listed across both positions conform to ANSI standards applicable in both the United States and Canada.
The BAY15d base found on the 1034NA, 1157NA, and 1157 bulbs features two offset pins that prevent incorrect insertion, a design intended to ensure proper filament alignment within the socket.