Harley-Davidson FXDL Low Rider Brake Bulb Size

Harley-Davidson FXDL Low Rider utilizes 3157 and 198 bulb sizes for brake applications, with each size corresponding to specific model configurations. The replacement chart covers 1993 through 2017 production years and documents bulb size specifications across the model's generation.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2014-2017	3157
1993-1998	198

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W.	198

Other Locations

Additional Notes

The Harley-Davidson FXDL Low Rider uses two distinct brake bulb types across its production years: the 3157 for model years 2014-2017 and the 198 for model years 1993-1998.
The 3157 is a dual-filament T25 wedge bulb rated at 12V with a 27W/7W output, meaning it operates one filament for running light duty and a second, brighter filament for braking signals.
The 198 is a miniature T5 wedge bulb rated at 12V and 2W, a significantly lower wattage than the 3157, reflecting a different brake light circuit design used in the earlier production years.
Both bulb types conform to ANSI standards applicable in the United States and Canada.
The T25 and T5 designations refer to the tubular bulb body size, with T5 being considerably smaller than T25, making the two types physically incompatible with each other's sockets.
The dual-filament design of the 3157 is a defining characteristic that distinguishes it from the single-function 198, and substituting one for the other would result in incorrect fitment and electrical incompatibility.