Suzuki Motorcycle DL650 V-Strom Turn Signal Bulb Size

Additional Notes

• The P21W bulb is the most widely used turn signal bulb across the Suzuki Motorcycle DL650 V-Strom's production history, appearing in both front and rear positions across the 2004-2016 model years, with the exception of 2010. It operates at 12V and 21W, uses a BA15s single-contact bayonet base, and conforms to ECE signalling standards used in European and worldwide markets.
• The PY21W bulb shares the same 12V and 21W electrical rating as the P21W but differs in two important ways: it produces amber-colored light natively and uses a BAU15s bayonet base, which has offset pins compared to the straight-pin BA15s base of the P21W. These two bulbs are not interchangeable despite their similar ratings.
• The 2017 Suzuki Motorcycle DL650 V-Strom uses a PY21W in the front turn signal position, while the 2018 model uses a PY21W only in the rear. This means the front and rear positions do not share the same bulb type across those years, and each position requires separate attention when sourcing replacements.
• The 12496 designation is a manufacturer part number used by Philips and Osram rather than an ECE standard code. It refers to a 12V halogen bulb intended for specialty applications. Both the front and rear turn signals on the 2019 model use this bulb type.
• The base type difference between P21W (BA15s) and PY21W (BAU15s) is a known fitment concern. The offset pins on the BAU15s base physically prevent a P21W from seating correctly in a PY21W socket, making cross-substitution between these two types mechanically incompatible in most housings.
• A bulb type transition occurs at the 2017 model year for the front turn signal, shifting from P21W to PY21W, and at the 2018-2019 model years for the rear, where PY21W appears in 2018 and 12496 in 2019. Owners of models near these transition years should confirm the exact year before sourcing replacements.