The Ford E-150 side marker utilizes bulb sizes 168, 194, and 3357 according to the provided technical specifications for the lighting components. Available data for the specified vehicle covers the range from 2003 through 2014 without any additional information provided.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford E-150 front side marker uses one of two bulb types depending on the headlamp configuration: the 168 or the 194, both of which are T10 miniature wedge bulbs operating at 12 volts and sharing the same physical base style.
Although the 168 and 194 share the T10 wedge form factor, they are not electrically identical. The 168 draws 4.9 watts while the 194 draws 3.78 watts, making them distinct specifications despite their physical similarity.
On the Ford E-150, the front side marker bulb required for 2008-2014 models depends on headlamp type. Halogen capsule headlamp configurations take a 168, while sealed beam headlamp configurations take a 194.
For model years 2004-2007, the front side marker uses a 168 regardless of headlamp configuration, as no conditional fitment is noted for those years.
From 1975 through 2003, the front side marker on the E-150 uses a 194 across all listed configurations, with the exception of 1992 and 1993, where both halogen capsule and sealed beam variants are explicitly noted as also using the 194.
The rear side marker on the Ford E-150 uses the 3357 bulb for model years 1992-2014. The 3357 is a single-filament T25 wedge bulb rated at 12 volts and 27 watts, representing a substantially higher wattage than either the 168 or 194 used at the front.
For model years 1975-1991, the rear side marker uses a 194, the same T10 miniature wedge type found in front side marker applications across much of the E-150 lineup.
The 3357 bulb is an ANSI-standard single-filament wedge type and is not interchangeable with the T10-based 168 or 194 bulbs due to differences in both physical size and wattage.
All three bulb types specified across the E-150 side marker positions conform to ANSI standards applicable in both the United States and Canada, and all operate on a 12-volt system.
The rear side marker position on the E-150 transitioned from the low-wattage 194 to the higher-wattage 3357 between the 1991 and 1992 model years, reflecting a change in the rear lighting assembly design.