The Dodge D50 front turn signal uses 1157 or 1034NA bulb sizes, while the rear turn signal requires 1157 or 198 bulb sizes. The replacement chart covers 1979 through 1982 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 is the most frequently specified bulb across the Dodge D50 turn signal positions, covering both front and rear applications for the 1980-1982 model years.
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, which allows it to serve both turn signal and parking light functions from a single housing.
The BAY15d bayonet base uses two offset pins to ensure correct filament orientation during installation, preventing the high and low filaments from being wired in reverse.
For the 1979 Dodge D50, the front turn signal position specifies the 1034NA rather than the 1157. The 1034NA shares the same BAY15d bayonet base and 12V/21W/5W dual-filament construction as the 1157 but is distinguished by its natural amber glass envelope.
Because the 1034NA is a variant of the 1157 with an amber-tinted glass envelope, it produces a colored output without relying on an amber lens, which affects how it interacts with the vehicle's existing lens color.
The 1979 rear turn signal position specifies the 198, a miniature wedge-base bulb rated at 12V and 2W. This is a single-filament T5 form factor, which is physically and electrically incompatible with the dual-filament 1157 and 1034NA used in other positions.
The shift from the 198 rear bulb in 1979 to the 1157 in 1980 represents a change in rear turn signal socket type, meaning the 1979 and 1980-1982 rear housings are not interchangeable without accounting for the different base types.
All bulb types listed for the Dodge D50 conform to ANSI standards applicable in both the United States and Canada, indicating standardized electrical and photometric ratings across those markets.