Chevrolet Spark front and rear turn signal bulbs utilize 7440NA, 7444NA, and 7443NA bulb sizes depending on location and model variation. The replacement chart covers 2013 through 2021 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 Chevrolet Spark turn signal specifications reference four bulb types across front and rear positions: 7440NA, 7444NA, 7443NA, and 7443. All four conform to ANSI standards applicable in the US and Canada and share the T20 wedge form factor.
The 7440NA is a single-filament bulb rated at 12V and 21W. The 7444NA, 7443NA, and 7443 are all dual-filament bulbs rated at 12V with a 21W/5W output, where the higher wattage serves the turn signal function and the lower wattage serves a secondary role such as a parking or running light.
The "NA" suffix on the 7440NA, 7444NA, and 7443NA designations indicates natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by a coating or the lens housing.
The 7443 used in the rear turn signal position for 2013-2015 is a clear-glass dual-filament T20 bulb with the same 12V, 21W/5W rating as its NA-suffix counterparts, distinguishing it only by the absence of tinted glass.
Because the 7440NA is single-filament and the 7444NA and 7443NA are dual-filament, these bulb types are not interchangeable despite sharing the T20 wedge base. Installing a single-filament bulb in a socket wired for dual-filament operation would result in the loss of one lighting function.
The 7444NA and 7443NA carry identical electrical ratings of 12V and 21W/5W and both use the T20 wedge base with natural amber glass. Their numeric difference reflects distinct ANSI part designations, and fitment should follow the year-specific specification rather than assumed cross-compatibility.
In the Chevrolet Spark (2021), both the front and rear turn signal positions use the same 7440NA bulb, making it the only model year in the specifications where a single bulb type covers both positions.
The front turn signal position on the Spark shows variation across the 2013-2021 range, with three different bulb types specified depending on the year, while the rear turn signal position uses only two bulb types across the same span.
The rear turn signal transitioned from the 7443 to the 7440NA between the 2015 and 2016 model years, representing a shift from a dual-filament to a single-filament bulb in that position.
All bulb types in these specifications operate on a 12-volt electrical system, consistent with standard automotive low-voltage architecture.