Harley-Davidson XL883L SuperLow Brake Bulb Size

Harley-Davidson XL883L SuperLow utilizes a 3157 bulb size for brake applications. The replacement chart covers 2011 through 2019 model years with corresponding bulb 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
2011-2019	3157

Bulb Specifications

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

Other Locations

Additional Notes

The Harley-Davidson XL883L SuperLow uses the 3157 bulb for the brake light position across all listed model years, spanning 2011-2019.
The 3157 is an ANSI-standardized bulb type recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared by multiple manufacturers.
This bulb follows the T25 wedge form factor, which describes its tulip-shaped glass envelope and the wedge-style base that seats directly into a socket without a separate metal cap or bayonet pins.
The 3157 operates on a 12-volt system and carries a dual-filament design rated at 27 watts for the high-intensity filament and 7 watts for the low-intensity filament, allowing a single bulb to serve both brake and running light functions.
The higher 27W filament activates when the brake is applied, producing a noticeably brighter output than the 7W running light state, which is a standard behavior for dual-filament automotive and motorcycle bulbs of this type.
Because the 3157 is an ANSI-standardized type, it is physically and electrically interchangeable with other bulbs sharing the same designation, regardless of brand, provided the voltage and wattage ratings match.
The 3157 should not be substituted with the visually similar 3156, which is a single-filament variant. Installing a 3156 in a dual-filament socket would result in the loss of one lighting function.