Harley-Davidson FLHRXS Road King Special Turn Signal Bulb Size

Harley-Davidson FLHRXS Road King Special rear turn signal bulb uses 199 size. The replacement chart covers 2017 to 2020 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.

Rear Turn Signal

Years	Bulb Type	Shop
2017-2020	199	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	199	Check Price

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Additional Notes

The 199 bulb is an ANSI-standardized type recognized in both the United States and Canada, operating at 12 volts with a power draw of 21 watts.
The Harley-Davidson FLHRXS Road King Special uses the 199 bulb for the rear turn signal across the 2017-2020 model years.
The 199 bulb uses a BA15s bayonet base, which is a single-contact base design that locks into its socket with a twist-and-push motion.
As a single-filament bulb, the 199 is dedicated to one lighting function, distinguishing it from dual-filament types that serve two functions from a single housing.
The 199 is a variant of the 1156 bulb. While the two types share the BA15s base and similar electrical ratings, they are not always interchangeable, as physical and optical differences between variants can affect fitment and light output in specific housings.