Nissan TITAN Daytime Running Light Bulb Size

Additional Notes

• The 7444NA is an ANSI-standardized bulb used in the North American market, meaning it follows a shared specification recognized across the United States and Canada. It is a dual-filament wedge bulb in the T20 form factor, operating at 12 volts with filaments rated at 21W and 5W respectively. Its natural amber glass produces a yellow-tinted light output without requiring a separate amber lens or coating.
• The 12277 is a Philips part number designation rather than an ANSI industry code, meaning it references a manufacturer-specific product. It is a single-filament halogen bulb with a PG18.5d-1 base, operating at 12 volts and 13 watts. The PG18.5d-1 base is a pin-type configuration specific to certain halogen capsule applications and is not interchangeable with standard wedge-base sockets.
• The Nissan TITAN uses the 7444NA for the 2022-2023 model years and the 12277 for the 2017-2019 model years, indicating that the two bulb types serve the same daytime running light function across different generations of the vehicle but are not interchangeable with one another due to differences in base type, wattage, and filament count.
• The 12277 fitment for 2017-2019 is conditioned on the presence of halogen capsule headlamps, meaning vehicles from those years equipped with a different headlamp system may not use this bulb size for daytime running lights.
• The dual-filament design of the 7444NA means it carries two independent circuits within a single bulb, which is a relevant consideration during replacement, as substituting a single-filament bulb in its place would result in the loss of one circuit's function.