Mercury Tracer front turn signal bulbs use 3357NA, 3457NA, or 1157 size configurations, while rear turn signal bulbs require 3157 or 1156 size specifications. The replacement chart covers 1988 through 1999 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercury Tracer front turn signal uses four distinct bulb types across its model years, while the rear turn signal alternates between two types depending on the generation of the vehicle.
The 1157 bulb is the most frequently specified type in these listings, appearing as the front turn signal bulb for the 1988, 1989, 1991, and 1992 Mercury Tracer. It is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21W high filament and 5W low filament.
The 1156 bulb serves as the rear turn signal for the 1988, 1989, 1991, and 1992 Tracer. Unlike the 1157, it is a single-filament design with a BA15s bayonet base, rated at 12V and 21W, meaning it performs only one lighting function rather than two.
The 3457NA bulb is specified for the front turn signal on the 1997-1998 Mercury Tracer. It is a dual-filament T25 wedge bulb with natural amber glass, rated at 12V with a 27W high filament and 7W low filament.
The natural amber glass of the 3457NA and 3357NA bulbs produces a colored output without relying on a tinted lens, which distinguishes them from clear-glass bulbs used in housings with amber-colored lenses.
The 3357NA, specified for the 1999 Mercury Tracer front turn signal, shares the T25 wedge form and natural amber glass with the 3457NA but differs in that it is a single-filament bulb rated at 12V and 27W.
The 3157 bulb is used for the rear turn signal on the 1997-1999 Tracer. It is a dual-filament T25 wedge bulb rated at 12V, 27W/7W, and unlike the 3457NA, it has clear glass rather than natural amber glass.
The T25 wedge base used by the 3157, 3357NA, and 3457NA bulbs is not interchangeable with the bayonet bases of the 1156 and 1157 bulbs, as the socket types are physically incompatible.
The 3357NA and 3457NA share the same T25 wedge base and voltage rating, but the 3357NA is single-filament while the 3457NA is dual-filament. Substituting one for the other in a dual-filament application would result in the loss of one lighting function.
All bulb types listed across both sub-parts conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical specifications within that regulatory scope.