Honda Motorcycle VTX1300C front turn signal bulbs use P21/5W size while rear turn signal bulbs use P21W size. The replacement chart covers 2004 through 2009 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle VTX1300C uses two distinct bulb types across its turn signal positions: the P21/5W at the front and the P21W at the rear, across the 2004-2009 model years.
The P21/5W is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base.
The BAY15d base features offset pins, which physically prevents it from being inserted in the wrong orientation, ensuring the two filaments are connected to the correct circuits.
The P21W is a single-filament bulb rated at 12V and 21W, mounted on a BA15s bayonet base, which uses a single contact pin centered at the base.
Both bulb types conform to ECE standards, meaning they are recognized for road use across European and other worldwide markets.
The front turn signal position on the VTX1300C (2004-2009) requires the P21/5W, while the rear requires the P21W. These two bulbs are not interchangeable due to their different base types, BAY15d versus BA15s.
The dual-filament design of the P21/5W front bulb allows it to serve more than one lighting function simultaneously, which is consistent with front positions that may combine turn signal and running light duties.
The single-filament P21W rear bulb is dedicated to one lighting function, consistent with a rear turn signal application that does not require a secondary filament.