Harley-Davidson FLHXXX Street Glide Trike Tail Light Bulb Size

Harley-Davidson FLHXXX Street Glide Trike tail light uses a 3157 bulb size. The replacement chart covers 2010 to 2011 production years with bulb size specifications.

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
2010-2011	3157

Bulb Specifications

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

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Additional Notes

The 3157 is an ANSI-standardized bulb type recognized across the United States and Canada, operating on a 12-volt system with a dual-filament design rated at 27 watts for the brake or turn signal function and 7 watts for the running light function.
The dual-filament construction of the 3157 allows a single bulb to serve two lighting functions simultaneously, which is a common arrangement in tail light assemblies where both a steady running light and a brighter stop or signal output are required.
The 3157 follows the T25 wedge form factor, a designation that describes the physical shape and base type of the bulb, which determines physical fitment into the socket.
The Harley-Davidson FLHXXX Street Glide Trike used the 3157 bulb for its tail light assembly across the 2010-2011 model years.
The 3157 shares its socket type with several related bulbs in the same family, such as the 3156 (single-filament) and the 4157, though these variants differ in filament count or wattage and are not direct equivalents in applications requiring dual-filament operation.