Ford Ranger Turn Signal Bulb Size

Additional Notes

• The 3157 bulb is the most frequently specified type across the Ford Ranger's front and rear turn signal positions, appearing in front applications from 1988-2000 and in rear applications across multiple model years spanning 1991-2003.
• The 1157 bulb, a dual-filament type with a BAY15d bayonet base rated at 12V and 21W/5W, was the standard fitment for both front and rear turn signals on the Ford Ranger from 1983-1987 at the front and 1983-1990 at the rear. It is the only bayonet-base bulb in these specifications; all other types use wedge bases.
• The T20 wedge form factor covers the 7440, 7440NA, 7443, and 7444NA bulb types, while the T25 wedge form factor covers the 3156, 3157, 3157NA, 3457NA, and 4157 types. These two form factors are not interchangeable with each other despite sharing similar voltage and wattage ratings in some cases.
• Several bulb types in these specifications carry the "NA" suffix, which denotes natural amber glass. This includes the 7444NA, 3157NA, 7440NA, and 3457NA types. The amber coloring is built into the glass envelope rather than achieved through a clear bulb and colored lens.
• The front turn signal on the Ford Ranger (2020-2023) uses the 7443, a dual-filament T20 wedge bulb rated at 12V and 21W/5W, while the rear turn signal for the same 2021-2023 model years uses the 7440, a single-filament T20 wedge rated at 12V and 21W. Although both share the T20 form factor, their filament count differs, making them non-interchangeable.
• The 2020 Ford Ranger rear turn signal is specified as the 3157 only with halogen capsule headlamps, representing a condition-dependent fitment within a single model year.
• The 3457NA, specified for the front turn signal from 2001-2004, shares the same voltage and wattage ratings (12V, 27W/7W) as the 3157NA but carries a different ANSI designation. These are distinct part numbers and are not confirmed as interchangeable by these specifications.
• The 2456 is the only festoon-type bulb in these specifications, appearing in the rear turn signal position for the 1994-1995 model years. Unlike the wedge and bayonet types used in all other listed positions, a festoon bulb makes contact at each end of the tube rather than through a base fitting.
• The 4157, specified for the rear turn signal from 2008-2011, is a dual-filament T25 wedge rated at 12V and 27W/7W, placing it in the same electrical class as the 3157. However, the two carry separate ANSI designations and are not listed as interchangeable within these specifications.
• The rear turn signal for the 1997 Ford Ranger uses the 3156, a single-filament T25 wedge, while the 1996 and 1998 model years use the dual-filament 3157. The single-filament and dual-filament T25 types share a physical form factor but differ in internal construction and pin configuration, which affects fitment compatibility.