Harley-Davidson FXDWG Dyna Wide Glide Turn Signal Bulb Size
Harley-Davidson FXDWG Dyna Wide Glide front turn signal bulbs measure 198 size while rear turn signal bulbs measure P21W size. The replacement chart covers 1993 to 1998 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Harley-Davidson FXDWG Dyna Wide Glide uses two distinct bulb types across its turn signal positions for the 1993-1998 model years: the 198 at the front and the P21W at the rear.
The 198 bulb follows the ANSI standard used in the United States and Canada. It is a miniature wedge-base type in a T5 form factor, rated at 12V and 2W, making it a low-output bulb suited to compact front signal housings.
The P21W bulb follows the ECE standard, which governs lighting equipment across Europe and much of the world. It is a single-filament signalling bulb rated at 12V and 21W, producing significantly more output than the front 198 bulb.
The P21W uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin. This base type is not interchangeable with wedge-base sockets, meaning the front and rear turn signal bulbs on this model are physically incompatible with each other's housings.
The 10.5-fold difference in wattage between the front 198 (2W) and the rear P21W (21W) reflects their different functional roles, with the higher-wattage rear bulb providing greater visibility from behind the vehicle.
The front 198 bulb specification remained unchanged across all six model years covered (1993-1998), as did the rear P21W specification, indicating no variation in turn signal bulb requirements within this production span.