Honda Motorcycle XL600V Transalp Turn Signal Bulb Size
Honda Motorcycle XL600V Transalp front and rear turn signal bulbs utilize a 1073 size with P21W specification. The replacement chart covers 1989 to 1990 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle XL600V Transalp uses two distinct turn signal bulb types across its model years: the 1073 and the P21W. Both share a BA15s single-contact bayonet base, meaning the physical mounting interface is identical between the two bulbs.
Despite sharing the same BA15s base, the 1073 and P21W are not electrically interchangeable. The 1073 operates at 12V and 13W, while the P21W operates at 12V and 21W. Substituting one for the other would alter the current draw on the turn signal circuit.
The 1073 bulb follows the ANSI standard, which is the specification system used in the United States and Canada. It is a lower-wattage variant of the more widely known 1156 bulb, producing 13W rather than the 1156's 21W output.
The P21W bulb follows the ECE standard, the regulatory framework used in Europe and much of the rest of the world. At 21W, it produces significantly more light output than the 1073 despite operating on the same 12V system.
The 1990 Honda Motorcycle XL600V Transalp uses the 1073 bulb for both front and rear turn signals, reflecting the ANSI-market specification for that year.
The 1989 model year uses the P21W bulb for both front and rear turn signals, reflecting the ECE-market specification for that year.
Both the front and rear turn signal positions share the same bulb specification within each model year, so a single bulb type services all four turn signal positions on a given motorcycle.