Hi guys, I wanted to give a quick update. I found the flasher, located behind the left fairing on the FX/XU.
I tried bypassing it by removing it and jumping the pins, and also tried attaching a generic 12v flasher, but neither worked. I finally brought it to the dealer yesterday, and they found that the flasher works, but there was no continuity between the flasher and the switch at the handlebar controls. So a new wiring harness is on order.
While I wait for the part to arrive, I did a temporary fix by running some wire from the flasher and splicing it into left hand controls connector of the wiring harness. (photos attached)
While digging around, I also found my headlight wires were starting to get chewed up by a zip tie keeping the wires organized. All the zip ties around the bike seemed a little tight, so it wouldn't surprise me if disconnect inside the harness was caused by a pinch at a zip tie. I'm going to go around the bike, re-zipping all the wires a little more loosely.