Cadillac CT4 Turn Signal Bulb Size

The Cadillac CT4 turn signal requires a bulb size of 7444NA for the specific lighting assembly. Data for the requested component covers the period from 2020 through 2020.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Turn Signal

Years	Bulb Size
2023-2024	7444NA
2021	7444NA

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T20), natural amber glass. 12V, 21W/5W.	7444NA

Additional Notes

The 7444NA is a dual-filament wedge bulb built to the T20 form factor, operating at 12 volts with a 21W filament for the turn signal function and a 5W filament for a secondary function such as parking or running light duty.
The natural amber glass of the 7444NA produces its amber output through the glass itself rather than through a clear bulb paired with an amber lens, which is a relevant distinction for fitment in housings designed around that characteristic.
The 7444NA carries ANSI standardization recognized in both the United States and Canada, placing it within a regulated specification framework for electrical and photometric performance.
The Cadillac CT4 front turn signal position uses the 7444NA across the 2021-2024 model years.
The T20 wedge base is a push-in connector type without a separate metal base, meaning the bulb is retained and makes electrical contact through the wedge-shaped plastic base alone.
Because the 7444NA is a dual-filament bulb, substituting a single-filament T20 variant such as the 7440 or 7440NA would result in the loss of one filament function and is not a direct replacement.