Lincoln Navigator front inner and front turn signal bulbs require a 3157NA bulb size, while rear turn signal applications use 4057, 4157, or 3157 bulb sizes. The replacement chart covers vehicle production years spanning 1998 through 2014 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 3157NA is the most widely used bulb type across the Lincoln Navigator's turn signal positions, serving as the specified front turn signal bulb for all model years from 1998-2014 and as the front inner turn signal bulb for 2007-2014.
The "NA" suffix in the 3157NA designation indicates natural amber glass, meaning the bulb envelope itself is tinted amber rather than clear. This allows it to produce an amber signal output without relying on a colored lens.
All four bulb types listed across these specifications, the 3157NA, 4057, 4157, and 3157, are dual-filament T25 wedge bulbs rated at 12V with a 27W high filament and a 7W low filament, making them functionally similar in electrical terms.
Because the 3157NA, 4057, 4157, and 3157 share the same T25 wedge base and identical voltage and wattage ratings, they are physically interchangeable in terms of socket fitment, though substituting a clear-glass bulb for the 3157NA in a position relying on the amber glass for color output would affect the signal's visible color.
The rear turn signal of the Lincoln Navigator uses three distinct bulb types across its production span: the 3157 for 1998-2004, the 4157 for 2005-2006, and the 4057 for 2007-2014.
The 4057 and 4157 differ from the 3157 family primarily in their ANSI numerical designation, which reflects differences in filament positioning or base indexing rather than voltage or wattage output, as all three share the same 12V, 27W/7W ratings.
All bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada, indicating compliance with North American automotive lighting regulations.
The front inner turn signal position is only specified for model years 2007-2014, which corresponds to a generation of the Navigator that incorporated a separate inner turn signal housing in the front lighting assembly.