The Mercedes-Benz G63 AMG tail light utilizes a P21/5W bulb size for the rear lighting assembly. Data for the specified component covers the period from 2013 through 2018.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The P21/5W is the sole bulb type specified for the outer tail light position across all listed model years of the Mercedes-Benz G63 AMG.
The P21/5W is an ECE-standard dual-filament bulb, meaning it contains two separate filaments within a single glass envelope, each operating at a different wattage.
The two filaments in the P21/5W operate at 21W and 5W respectively, with the higher-wattage filament typically serving the brake light function and the lower-wattage filament serving the running light function.
The P21/5W uses a BAY15d bayonet base, which is an offset twin-pin fitting. The offset pin placement prevents the bulb from being inserted in the wrong orientation, ensuring each filament connects to its correct circuit.
The bulb operates at 12V, consistent with the standard electrical system voltage found in passenger vehicles.
The outer tail light of the G63 AMG uses the P21/5W across the 2013-2018 model years according to the specifications.
Because the P21/5W uses a BAY15d base rather than the visually similar BAY15s single-filament base, substituting a single-filament P21W bulb would result in incorrect fitment and circuit function.