Not sure where I went wrong hooking this thing up.
Bought a cheap 1157 LED from ebay and it worked fine.
When I hooked up the flasher unit I also hooked up the incandescent brake light on my Givi top case.
Tested the brake switches and both lights flashed like they should.
Turned off the bike and worked on other stuff (LED headlights) Voyager install.
Came back later to test the headlights and saw the rear running light was off.
Pulled the front brake and no flashing brake light.
When wiring the flasher I looked at the black box and it looked like you cut both blue (brake) and black (ground) wires.
I remember reading Toney's directions above but that was weeks ago and it apparently wasnt retained by central.
Switched the incandescent back and it worked but it was slow to light up. 1-2 seconds is too long in traffic.
Today I soldered both black wires together and switched back to the LED bulb and nothing.
Figured I'll look at it later (I wanna ride tomorrow) and soldered both red wires together.
LED still doesnt work but the incandescent does.