The Dodge W300 front turn signal requires a 1157, 1157NA, or 1034NA bulb size, while the rear turn signal uses a 1157 or 198 bulb size. The replacement chart covers 1975 through 1980 model years 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 Dodge W300 front and rear turn signal specifications span model years 1975-1980, with four distinct bulb types appearing across those positions: 1157, 1157NA, 1034NA, and 198.
The 1157 is a dual-filament bulb rated at 12V with a 21W high filament and a 5W low filament, mounted on a BAY15d bayonet base. It is an ANSI standard type recognized in both the United States and Canada.
The 1157NA shares the same 12V, 21W/5W dual-filament construction and BAY15d bayonet base as the 1157, but its glass envelope is natural amber rather than clear. This coloring shifts the emitted light toward amber without a separate lens filter.
The 1034NA is described as a variant of the 1157 and carries the same 12V, 21W/5W ratings and BAY15d bayonet base, also with natural amber glass. Despite the variant relationship, the 1034NA and 1157 carry different ANSI designations and are not listed interchangeably in these specifications.
The 198 is a miniature wedge bulb of the T5 form factor, rated at 12V and 2W. It is a single-filament type, which contrasts sharply with the dual-filament 1157-series bulbs used elsewhere in the same vehicle.
For the Dodge W300 front turn signal, the 1157 applies to 1979-1980, the 1157NA applies to 1976 and 1978, the 1034NA applies to 1977, and the 198 applies to 1975.
The rear turn signal position uses the 1157 for 1979-1980 and the 198 for 1975-1978, reflecting a split between the higher-wattage dual-filament type and the low-wattage wedge type across those years.
The BAY15d bayonet base used by the 1157, 1157NA, and 1034NA features two offset pins, a design that prevents incorrect rotational insertion and is standard across all three of those bulb types in these specifications.
The wattage difference between the 198 at 2W and the 1157-series at 21W/5W is substantial. Substituting one type for the other would be electrically incompatible with the socket and circuit intended for the specified bulb.
The 1977 front turn signal position is the only instance in these specifications where the 1034NA is listed, making it a year-specific fitment distinct from the 1157NA used in adjacent model years for that same position.