Mine works fine with LED brake light "bulbs" plus an auxiliary LED brake light. Even so, one can't tell if the LEDs or bulbs are working at any given time but I figure most likely only one of the three will fail unless the signal itself is not getting to the LEDs. To tell if the brake light signal is working, I ran a wire to a small LED on my dash that lights up when the brake light signal is working. And, because the modulator is electronic and subject to fail, I have 2 switches under the seat to switch between the 2 different styles of modulation or to bypass the modulator altogether should it fail.
I know it sounds complicated but it works for me. YMMV
P.S. This is from the Signal Dynamics info, "This module is designed to work with standard incandescent brake lights, LED brake lights, or a combination of both"
"I feel more like I do now than I did a while ago."
Last edited by OCADVR; 04-26-2019 at 12:51 PM.