Fat Boy Auxiliary Run, Brake & Turn Taillight for 2018-2025 FLFB/FLFBS

CD-FATBOY-S
$129.95  Each
$129.95  Each
Shipping calculated at checkout.

Verify Your Fitment

Fitment for U.S. models only, unless otherwise noted.

This fits your vehicle!
( CHANGE VEHICLE )
Click here to find fitting parts.
This does not fit your vehicle.
( CHANGE VEHICLE )
Click here to find fitting parts.

Question about this product?

We're happy to help.

Integrated Fat Boy LED Taillight is a simple plug and play addition to the rear fender on 2018-2025 Harley-Davidson® Fat Boy (FLFB/FLFBS). Mounting with double-sided automotive grade tape, it adds 40 super bright LEDs as a running and brake light. Left and right turn signals split the taillight bar with 20 red LEDs per side.

Compatible with Custom Dynamics® Magic Strobes™ Brake Light Flasher (sold separately) to add brake flash & strobe patterns for more visibility.

Warning: Cancer & Reproductive Harm — www.p65warnings.ca.gov

Fitment

2018-2021 US MODEL Harley-Davidson® Fat Boy (FLFB/FLFBS). Does Not Fit Canada (CNA) or International (HDI) Models.

Specifications

  • RUN, BRAKE, TURN FUNCTION
  • 40 DUAL INTENSITY RUN/BRAKE LEDS
  • 20 RED TURN LEDS PER SIDE
  • PLUG & PLAY INSTALLATION
  • RED OR SMOKED LENS
  • LIFETIME LED WARRANTY

Instructions

Compatible Fitment
This part fits the following vehicles:
Type Year Make Model
Loading fitment data...
  • 5 stars: 8 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
A
Ali Fara

The taillight is really bright, installed with no issues, and it really enhances the appearance of the rear fender. I'm really happy with my purchase!

D
Daniel M Murphy

Love it¡!!!!!!!!!!

D
DMVFatBoy
Great light

I have a 2025 Fatboy, this rear light was a true plug and play. The only complaint I have is the adhesive that comes with the light to secure the wire is very thin and cheap. It was difficult peeling off the protective film without the adhesive coming off. Besides that, this light is bright, beautiful and was easy to install.

2
24 k , I got a reflector.
Custom Dynamics did it again where HD failed

Didn’t notice I didn’t have a tail light for about two weeks after I got my 2025 Fat Boy , this was unacceptable. Installed this beautiful plug and play tail light/directionals, break and hazard unit. 4 bolts and removed the rear fender. Installed the the new unit and secured the wiring on my kitchen table. Easy do it yourself installation!! Thanks CD , you did it again!!!

K
Kenny
Perfect Fat Boy

Perfect fit and problem free product for over a year now. Lights really pop, especially at night. Lights sync with the brakes and turn signals... Recommended.

M
Marc QPAL
THE Best!

Awesome Product ,really plug and play.
Thank you CD.

P
Paul
Very bright and great fit.

This RTB is perfect. Install took maybe and hour complete. The light and connectors for the bike perfectly with no modification needed. Very bright and just what this bike needed. Even better than the clunky factory tail light they recently added for 24. Nice having directions written in English too! Highly recommend even if you are not particularly mechanical. PS. Also worked with the license plate relocation kit.

g
golf pro
Bought this fender brake light flashing mode

super brake light very bright brake, turn signals.