The Mercury Sable brake light utilizes bulb sizes 1157, 2458, and 3157 depending on the specific application. Data for the provided components covers the period from 1986 through 1999.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercury Sable brake light circuit uses two distinct bulb types across its production span. The 3157 and 1157 are both dual-filament designs, meaning a single bulb serves both the running light and the brighter stop light function through separate filaments operating at different wattages.
The 3157 is a T25 wedge-base bulb rated at 12V with filaments drawing 27W and 7W respectively. It fits the Mercury Sable brake position for model years 1996-1999.
The 1157 carries a BAY15d bayonet base rather than a wedge base, rated at 12V with filaments drawing 21W and 5W. This base type physically differs from the T25 wedge, making the 1157 and 3157 non-interchangeable despite both being dual-filament brake bulbs. The 1157 applies to the 1986 Mercury Sable brake position.
The center high mount stop light on the Mercury Sable uses single-filament wedge bulbs exclusively, as the CHMSL serves only one lighting function and requires no dual-filament design.
Two closely related T15 wedge bulbs, the 921 and 912, are specified for the center high mount stop light depending on model year. Both share the same T15 wedge base form factor and 12V operating voltage, but differ in wattage: the 921 draws 16W while the 912 draws 12W.
Because the 921 and 912 share the same T15 wedge base, physical fitment in the socket is possible for either bulb. However, the wattage difference means they are not rated equivalents, and substituting one for the other may affect light output intensity.
The 912 is specified for the center high mount stop light across the 1986 and 1996-1999 Mercury Sable model years, while the 921 applies to the 2008-2009 model years.
All four bulb types listed in the specifications, the 3157, 1157, 921, and 912, conform to ANSI standards applicable in both the United States and Canada.