Blue Bird All American RE front and rear turn signal bulb sizes include 1157, 1073, and 1156 options for the replacement chart. The replacement chart covers vehicle production years spanning 2000 to 2018.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 bulb is the most frequently specified type across the Blue Bird All American RE turn signal positions, covering both front and rear applications for the 2013-2018 model years, with the exception of 2012 and 2010.
The 1157 is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base. Its dual-filament design allows a single bulb to serve both turn signal and running light functions within the same housing.
The 1156 bulb is specified for both the front and rear turn signals on the Blue Bird All American RE for the 2000-2003 model years. It is a single-filament bulb rated at 12V and 21W, using a BA15s bayonet base.
The 1073 bulb is specified for both front and rear positions in the 2010 and 2012 model years. It is a single-filament bulb rated at 12V and 13W, also using a BA15s bayonet base.
Although the 1073 and 1156 share the same BA15s bayonet base, they are not interchangeable. The 1073 operates at 13W while the 1156 operates at 21W, meaning substituting one for the other would result in incorrect light output for the intended circuit.
The 1157 uses a BAY15d base, which is physically distinct from the BA15s base used by both the 1073 and 1156. The offset pins on the BAY15d base prevent it from being inserted into a BA15s socket, making cross-substitution between the 1157 and the other two types mechanically impossible.
The front and rear turn signal positions on the Blue Bird All American RE share identical bulb specifications for every model year in the data, indicating a consistent socket type is used across both locations within any given year.
The 2011 model year uses the 1157 for both turn signal positions, while the adjacent 2010 and 2012 model years use the 1073, representing a single-year reversion to the higher-wattage dual-filament type within that period.
All three bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada, indicating they are standardized across North American automotive lighting applications.
The 1157, 1073, and 1156 are all 12-volt bulbs, consistent with the standard electrical system voltage used in automotive and school bus applications.