Dodge Royal front and rear turn signal bulbs utilize 1034 and 1154 sizes. The replacement chart covers 1954 through 1959 vehicle production specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1034 and 1154 bulbs are the two types specified for the Dodge Royal's turn signals, covering both front and rear positions across the 1954-1959 model years.
Both the 1034 and 1154 are dual-filament bulbs sharing the BAY15d bayonet base, a two-pin offset base design that physically locks the bulb into the socket at a fixed rotational position.
Both bulb types are ANSI-standardized for the US and Canadian markets.
The 1034 is a variant of the 1157, rated at 12V with a 21/5W dual-filament output, where the higher wattage filament serves the turn signal function and the lower serves a secondary function such as running light.
The 1154 is an older variant of the 1157 and carries a 6V/12V rating, reflecting its design origin in an era when automotive electrical systems were transitioning between those two voltages.
The Dodge Royal used the 1154 bulb in both the front and rear turn signal positions for the 1954-1955 model years.
The 1034 bulb replaced the 1154 across both front and rear turn signal positions beginning with the 1956 model year, continuing through 1959.
Although the 1034 and 1154 share the same BAY15d base type, their differing voltage specifications mean they are not directly interchangeable without accounting for the vehicle's electrical system voltage.