Dodge D150 front and rear turn signal bulbs utilize 2057NA, 2057, 1157, and 198 sizes depending on location and model variation. The replacement chart covers 1977 to 1993 production years 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 1157 bulb is the most frequently specified type across the Dodge D150 turn signal data, appearing in both front and rear positions across multiple model years. It is a dual-filament bulb with a BAY15d bayonet base rated at 12V and 26.9W/8W, conforming to the ANSI standard used in the United States and Canada.
The 2057 and 2057NA bulbs share the same BAY15d bayonet base and 12V, 26.9W/8W electrical rating as the 1157 but are noted as brighter variants of it. The 2057NA further incorporates natural amber glass, which produces the amber color through the glass itself rather than a clear bulb in an amber housing.
The 1034NA, specified for the Dodge D150 front turn signal in 1977-1978, is a dual-filament BAY15d bulb with natural amber glass rated at 12V and 21W/5W, making it electrically equivalent to the 1157 while sharing the amber glass characteristic of the NA-suffix bulbs.
Because the 1157, 2057, 2057NA, and 1034NA all use the BAY15d bayonet base, they are physically interchangeable at the socket level. However, substituting a non-NA bulb in a position originally specifying an NA type may affect the amber color output if the lens housing is clear rather than amber-tinted.
The 198 bulb, specified for the rear turn signal in 1977-1978, is a miniature wedge-base T5 bulb rated at 12V and 2W. It is a single-filament, low-wattage type and is not electrically or physically compatible with the BAY15d bulbs used in all other listed positions.
The front turn signal specification for the D150 changed from the 1034NA in 1977-1978 to the 1157 starting in 1979, representing a shift from the natural amber glass variant to a clear dual-filament bulb of the same wattage and base type.
The rear turn signal for 1977-1978 used the 198 wedge bulb, while the front used the 1034NA bayonet bulb in those same years, meaning the front and rear turn signal sockets were not interchangeable during that period.
In 1988, the rear turn signal specification is listed as 2057 while the front is listed as 1157. Although both share the BAY15d base, the wattage difference between the two types means the rear produced a higher light output than the front that year.
The 1992 front turn signal is specified as 2057, while the adjacent years 1991 and 1993 specify the 2057NA. The 2057 and 2057NA share identical electrical ratings and base types, with the only distinction being the presence of natural amber glass in the NA variant.
Across the full span of the specifications, the rear turn signal used the 1157 more consistently than the front, where the 2057, 2057NA, and 1034NA appeared at various points, indicating that the front position saw more variation in bulb type over the production years covered.