Suzuki Motorcycle LT-A750 KingQuad AXi Brake Bulb Size

Additional Notes

• The Suzuki Motorcycle LT-A750 KingQuad AXi uses the P21/5W bulb type for its brake light across all model years listed in the specifications, spanning 2008-2019.
• The P21/5W is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope. The higher 21W filament serves the brake or turn signal function, while the lower 5W filament handles a secondary role such as a tail or parking light.
• The P21/5W operates on a 12V electrical system, which is standard for most powersports and automotive applications in this category.
• This bulb type uses a BAY15d bayonet base. The BAY15d designation indicates an offset pin configuration, where the two retaining pins are positioned at different heights on the base. This offset is intentional and prevents the bulb from being inserted in the wrong orientation, ensuring each filament connects to the correct circuit.
• The P21/5W conforms to ECE (Economic Commission for Europe) standards, a regulatory framework recognized across Europe and numerous other markets worldwide, governing bulb output, color, and performance requirements.
• Because the BAY15d base uses asymmetrically placed pins, it is not interchangeable with the similarly appearing BA15d base, which features pins at equal heights. Substituting one for the other is not possible without modification to the socket.
• The consistent use of a single bulb specification across all listed model years from 2008 to 2019 indicates that the brake light socket and circuit design remained unchanged throughout that production period for this model.