The Freightliner Columbia front turn signal requires a 4157NA bulb size while the rear turn signal uses a 1157 bulb size. The replacement chart covers vehicle production spanning 2000 to 2017 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Freightliner Columbia uses two distinct bulb types across its turn signal positions: the 4157NA for the front and the 1157 for the rear, both conforming to ANSI standards recognized in the United States and Canada.
The 4157NA is a dual-filament bulb in a T25 wedge form factor with natural amber glass, rated at 12V and drawing 27W on the high filament and 7W on the low filament. The natural amber glass produces the required amber signal color without relying on a colored lens.
The 1157 is a dual-filament bulb fitted with a BAY15d bayonet base, rated at 12V and drawing 21W on the high filament and 5W on the low filament. The BAY15d base features two offset pins that prevent incorrect insertion orientation.
Dual-filament construction in both bulb types allows a single bulb to serve two functions, typically combining turn signal operation on the higher-wattage filament with a secondary function such as parking or running light on the lower-wattage filament.
The front and rear turn signal positions use physically incompatible base types. The 4157NA uses a wedge base while the 1157 uses a bayonet base, making the two bulbs non-interchangeable between positions.
The Freightliner Columbia (2000-2017) specifies the 4157NA for the front turn signal across all model years covered in these specifications.
The 1157 rear turn signal specification also applies uniformly across the full 2000-2017 model year range, with no variation noted across that span.
The wattage difference between the two bulbs is notable: the 4157NA front bulb draws 27W at full intensity, while the 1157 rear bulb draws 21W, reflecting a difference in luminous output between the two positions.