Kawasaki KAF1000 Mule PRO-DX Diesel Brake Bulb Size

Additional Notes

• The P21/5W is the brake bulb type used across all listed model years of the Kawasaki KAF1000 Mule PRO-DX Diesel, covering the 2016-2019 range.
• The P21/5W is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope. The higher-wattage filament at 21W serves the brake or turn signal function, while the lower filament at 5W handles a secondary role such as running or parking light duty.
• The bulb operates on a 12V electrical system, which is standard for this class of utility vehicle application.
• The P21/5W uses a BAY15d bayonet base. The BAY15d designation indicates an offset dual-contact base, where the two pins are positioned at different heights to prevent incorrect installation of a single-filament bulb in place of a dual-filament one.
• The P21/5W is governed by ECE regulations, a lighting standard recognized across Europe and many other markets worldwide. This origin affects how the bulb is rated and tested relative to North American SAE standards.
• Because the BAY15d base is offset, it is not interchangeable with the BA15d base, which shares the same physical pin spacing but lacks the offset. Substituting an incompatible base type would result in incorrect fitment.