Dodge Royal Monaco front turn signal bulbs utilize 1034NA or 1157NA sizes, while rear turn signal bulbs require 1157 size specifications. Replacement chart data covers 1975 through 1977 production years with corresponding bulb size information.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Dodge Royal Monaco uses three bulb types across its front and rear turn signal positions for the 1975-1977 model years: the 1034NA, 1157NA, and 1157.
All three bulb types share the BAY15d bayonet base, meaning the physical mounting interface is consistent across all turn signal positions on the Royal Monaco regardless of model year.
All three types are dual-filament bulbs rated at 12V with a 21W/5W output, where the higher wattage filament serves the turn signal function and the lower wattage filament serves a secondary function such as parking or running light.
The 1034NA and 1157NA both feature natural amber glass, which produces an amber light output without requiring an amber lens or external filter.
The 1034NA is described as a variant of the 1157, sharing the same BAY15d base and 12V, 21W/5W ratings, though it differs in its natural amber glass construction.
The rear turn signal position on the Royal Monaco uses the 1157 for all three model years, 1975-1977, indicating no change in rear fitment across this production span.
The front turn signal position alternates between the 1034NA in 1975 and 1977 and the 1157NA in 1976, meaning the 1976 model year is distinct from the surrounding years in its front bulb specification.
Although the 1034NA and 1157NA share the same base type and wattage ratings as the 1157, substituting a clear-glass 1157 in a position specified for a natural amber variant may affect the color output if the housing lens is also clear rather than amber-tinted.
All three bulb types conform to ANSI standards applicable in both the United States and Canada, reflecting a standardized North American specification.