Mercedes-Benz GLC63 AMG S front turn signal bulbs use 12174NA or 12496 size, while rear turn signal bulbs use 12496 size. The chart covers 2018 to 2020 replacement bulb specifications for these turn signal applications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz GLC63 AMG S front turn signal requires the 12174NA bulb for the 2018 and 2020 model years when equipped with halogen capsule headlamps, while the 2019 model year uses the 12496 bulb in the same configuration.
The 12174NA is an OEM-designated part number featuring natural amber glass construction and operates on a 12V electrical system.
Natural amber glass in the 12174NA means the amber color is produced by the glass envelope itself rather than by a coating or lens tint, which is a characteristic associated with longer-lasting color output.
The 12496 is a Philips/Osram part number classified as a halogen bulb for specialty applications, also rated at 12V.
The rear turn signal on the GLC63 AMG S uses the 12496 bulb across all three model years covered, spanning 2018-2020.
The front turn signal fitment for the 2019 GLC63 AMG S differs from both the 2018 and 2020 model years, meaning the 12496 and 12174NA are not interchangeable across those front positions despite sharing the same 12V operating voltage.
The front turn signal specifications apply exclusively to vehicles equipped with halogen capsule headlamps, indicating that other headlamp configurations may carry different bulb requirements.