Ford F-350 Super Duty Turn Signal Bulb Size

Ford F-350 Super Duty front and rear turn signal bulbs utilize multiple sizes including 194, 3157, 3157NA, 4157, 4257NA, 7443NA, and 7444NA, with inner, outer, and standard front positions requiring different bulb sizes. The replacement chart covers 1999 to 2023 model years and details bulb size specifications across the vehicle production range.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Inner Turn Signal

YearsBulb Size
2007-20103157NA (With Halogen Capsule Headlamps)
4157 (With Sealed Beam Headlamps)

Front Outer Turn Signal

YearsBulb Size
2007-2010194

Front Turn Signal

YearsBulb Size
20234257NA
2021-20227444NA
2018-20207444NA (With Halogen Capsule Headlamps)
20177443NA (With Halogen Capsule Headlamps)
2007-20163157NA
20063157NA (With Halogen Capsule Headlamps)
4157 (With Sealed Beam Headlamps)
2004-20053157NA (With Halogen Capsule Headlamps)
3157 (With Sealed Beam Headlamps)
1999-20033157

Rear Turn Signal

YearsBulb Size
20233157
2021-20224257NA
2017-20203157 (With Halogen Capsule Headlamps)
2007-20163157
20064157
1999-20053157

Bulb Specifications

Description Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W.3157NA
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.4157
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.194
ANSI standard (US & Canada). Dual-filament wedge bulb, natural amber glass. 12V.4257NA
ANSI standard (US & Canada). Dual-filament wedge bulb (T20), natural amber glass. 12V, 21W/5W.7444NA
ANSI standard (US & Canada). Dual-filament wedge bulb (T20), natural amber glass. 12V, 21W/5W.7443NA
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.3157

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