Mercury Mystique brake bulbs utilize 3157 and 1157 sizes, while the center high mount stop light requires a 2723 bulb size. The replacement chart covers 1995 to 2000 production 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 Mercury Mystique brake light specifications cover the 1995-2000 model years, with two distinct bulb types used across that production run depending on the year.
The 1157 bulb is specified for the Mercury Mystique brake lights from 1995-1998. It is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with filaments drawing 21W and 5W respectively.
The BAY15d bayonet base on the 1157 features two offset pins that prevent incorrect insertion, a common design in dual-filament automotive applications where polarity and filament alignment are critical.
The 3157 bulb replaces the 1157 for the 1999-2000 Mercury Mystique brake lights. Although it is also a dual-filament 12V bulb, it uses a T25 wedge base rather than a bayonet mount, making it physically incompatible with sockets designed for the 1157.
The 3157 is rated at 27W/5W, giving its primary filament a notably higher wattage than the 1157's 21W primary filament, which reflects a difference in light output between the two generations of the vehicle.
Because the 1157 and 3157 use different base types, a bayonet socket and a wedge socket, the bulbs are not interchangeable between the 1995-1998 and 1999-2000 model years of the Mystique.
Both the 1157 and 3157 conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical tolerances across manufacturers producing these bulb types.
The center high mount stop light on the Mercury Mystique uses the 2723 bulb across all model years from 1995-2000, with no change in specification throughout the entire production run.
The 2723 is a miniature T5 wedge bulb rated at 12V and 1.4W, a single-filament design suited to the lower-intensity requirements of a supplemental stop light position rather than a primary brake light.
The 2723 also conforms to ANSI standards for the US and Canadian markets, consistent with the other bulb types specified for the Mystique.