Cadillac XTS Turn Signal Bulb Size

Additional Notes

• The 7443NA and 7444NA are both dual-filament wedge bulbs built to the T20 form factor, operating at 12 volts with a 21W/5W power split between their two filaments.
• The higher-wattage filament at 21W serves the turn signal function, while the lower-wattage filament at 5W typically serves a parking or position light function in dual-filament applications.
• Both bulb types carry natural amber glass, meaning the amber color is produced by the glass itself rather than by a coating applied over clear glass.
• The 7443NA and 7444NA conform to ANSI standards recognized in the United States and Canada, placing them within a regulated specification for base dimensions and electrical performance.
• Despite sharing the same T20 wedge base, voltage, and wattage ratings, the 7443NA and 7444NA are distinct part numbers, and the Cadillac XTS front turn signal position does not use the same bulb across all model years.
• The 2013 and 2017-2018 Cadillac XTS front turn signal position calls for the 7443NA, while the 2014-2016 model years require the 7444NA instead.
• Because the 7443NA and 7444NA share the same T20 wedge base, physical installation may be possible with either type, but the differing part numbers indicate they are not confirmed as interchangeable for this application.