Toyota 4Runner Tail Light Bulb Size

Additional Notes

• The outer tail light position on the Toyota 4Runner uses three distinct bulb types across its production history: the 7443, 1157, and 1034.
• The 7443 is a dual-filament wedge bulb in the T20 form factor, rated at 12V with a 21W high filament and 5W low filament, conforming to ANSI standards for the US and Canadian markets.
• The 1157 and 1034 are both dual-filament bulbs sharing the BAY15d bayonet base and the same 12V, 21W/5W electrical rating, with the 1034 classified as a variant of the 1157.
• The 7443 is the dominant bulb type across the outer tail light specifications, covering model years 1996-2013 in the majority of entries.
• The 1157 applies to the 1990-1995 model years, while the 1034 applies to 1984-1989, reflecting a progression through three different bulb standards over the vehicle's history.
• The 1996 model year carries a production date qualifier of "From 11/1995," indicating that the transition from the 1157 to the 7443 occurred partway through that model year rather than at its start.
• Similarly, the 2000, 2005, and 2013 model years include "To" date qualifiers, signifying mid-year fitment boundaries that affect which bulb size is applicable depending on the vehicle's production date.
• Because the 7443 uses a wedge base and the 1157 uses a BAY15d bayonet base, these two bulb types are not physically interchangeable despite sharing the same wattage ratings.
• The 1034 and 1157 share the BAY15d base, but as distinct ANSI part numbers they are not guaranteed to be direct substitutes without confirming compatibility for the specific application.
• For 2013 Toyota 4Runner outer tail light fitment, two separate entries exist: one specifying the 7443 with a "To 08/2013" qualifier and one without a date restriction, indicating that production date verification is necessary for that model year.