Kawasaki KAF620 Mule 4010 Trans 4x4 Brake Bulb Size

Additional Notes

• The P21/5W is the brake bulb type specified for the Kawasaki KAF620 Mule 4010 Trans 4x4 across the 2015-2022 model years covered in these specifications.
• P21/5W is a dual-filament bulb, meaning it contains two separate filaments within a single housing. The higher 21W filament serves the brake or stop function, while the lower 5W filament handles a secondary role such as running or tail light duty.
• The P21/5W operates on a 12V electrical system, which is consistent with the standard voltage found in most small utility vehicles of this type.
• This bulb 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 prevents the bulb from being inserted in the wrong orientation, ensuring the correct filament aligns with the correct circuit.
• The P21/5W is governed by ECE (Economic Commission for Europe) standards, giving it broad acceptance across European and international markets. This regulatory classification affects how the bulb is tested and rated for signalling applications.
• Because the BAY15d base uses asymmetric pins, it is not interchangeable with the BA15d base, which features pins at equal heights. Substituting a BA15d bulb in a BAY15d socket would result in incorrect fitment.
• The P21/5W should not be confused with the P21W, which is a single-filament bulb sharing a similar appearance. Installing a single-filament P21W in place of a dual-filament P21/5W would disable one of the two lighting functions the circuit is designed to support.