Plymouth Suburban front and rear turn signal bulbs utilized 1034, 1154, or 1158 size specifications depending on production year, with bulb size varying across the model line. The replacement chart covers 1950 through 1961 model years and documents the corresponding turn signal bulb specifications for each production year.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Plymouth Suburban uses three distinct bulb types across its turn signal specifications: the 1034, 1154, and 1158, all of which are ANSI-standardized dual-filament bulbs sharing the BAY15d bayonet base.
The BAY15d base is an offset twin-contact bayonet fitting. The offset pin placement prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
The 1034 bulb is rated at 12V with a 21/5W dual-filament output and is described as a variant of the more widely known 1157 bulb.
The 1154 bulb is an older variant of the 1157 and carries a dual voltage rating of 6V/12V, reflecting its use across an era when automotive electrical systems were transitioning between those two standards.
The Plymouth Suburban uses the 1034 bulb in both the front and rear turn signal positions for the 1956-1961 model years.
The 1154 bulb serves both the front and rear turn signal positions for the 1951-1955 model years.
The 1158 bulb is specific to the 1950 Plymouth Suburban, covering both front and rear turn signal positions.
Although the 1034 and 1154 share the BAY15d base with each other and with the 1158, their differing voltage ratings and filament specifications mean they are not interchangeable without accounting for the vehicle's electrical system requirements.
The 1034 and 1154 are both described as variants of the 1157, but the 1154 predates the 1034 in automotive use, as reflected in its appearance in the earlier model years of this specification set.
The front and rear turn signal positions on the Plymouth Suburban use identical bulb sizes for every model year listed, indicating a uniform bulb specification across both signal locations within each given year.