The Lincoln Mark V front and rear side marker bulb sizes consist of 194 bulbs for front applications and 194, 1157, or 168 bulb sizes for rear applications. The replacement chart covers 1977 through 1979 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 Lincoln Mark V uses three distinct bulb types across its front and rear side marker positions for the 1977-1979 model years: the 194, the 168, and the 1157.
The 194 and 168 are both T10 miniature wedge bulbs operating at 12V, though they differ in wattage. The 194 draws 3.78W while the 168 draws 4.9W, making them physically similar but electrically distinct.
Despite their shared T10 form factor, the 194 and 168 are not rated at identical wattages, which is a relevant consideration when evaluating substitution between the two types.
The 1157 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21W/5W output. Its bayonet base and dual-filament construction make it physically and electrically incompatible with the wedge-type 194 and 168 bulbs.
All three bulb types conform to ANSI standards applicable in both the United States and Canada.
The Lincoln Mark V front side marker position uses the 194 bulb uniformly across all three model years, 1977-1979.
The rear side marker position of the Lincoln Mark V does not share a single bulb type across its production run. The 1977 model uses the 168, the 1978 model uses the 1157, and the 1979 model returns to the 194.
The 1978 rear side marker specification calls for the 1157, a bulb with a significantly higher primary filament wattage of 21W compared to the single-filament wedge bulbs used in the other model years, indicating a different lamp assembly for that year.