Ford B-600 front and rear side marker bulbs utilize 194 and 168 bulb sizes depending on location and model configuration. The replacement chart covers vehicle production spanning 1980 to 1994 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 Ford B-600 uses the 194 bulb for the front side marker position across all listed model years, spanning 1980-1994.
The 194 is an ANSI-standard miniature wedge bulb rated at 12V and 3.78W, housed in a T10 form factor.
The 168 bulb shares the same ANSI-standard T10 wedge form factor as the 194 but operates at a higher wattage of 4.9W on a 12V circuit.
Although the 194 and 168 bulbs share the same T10 physical form factor, their wattage ratings differ, and they are not interchangeable without accounting for that electrical difference.
The rear side marker position on the Ford B-600 uses the 194 bulb for model years 1983-1984 and 1991-1994.
The 1980 Ford B-600 rear side marker position specifies the 168 bulb rather than the 194 used in other listed years.