Join Date: Jun 2018
Location: Silver City, NM
Sounds like a loose connection somewhere. The reason I say that is because, if I understand correctly, the system works intermittently. The turn signals on my 04 v92tc stopped working and I assumed it was the Turn Signal/Hazard Flasher. I set about testing the thing and then lost all fire to the turn signal bulbs. I checked wires and connections for some time and one day, while working on the bike and talking to my wife the lights came back on. They did not blink but came back on. SHORT. The first harness I had moved was the one connecting to the Flasher. After a quick look I saw the ground wire broken at the connector. Some solder and a replacement Turn Signal/Hazard Flasher and I was back in business.
It helps to have the manual.
You may be able to find a used working speedo on eBay, but they are often pricey.
Good luck with it. A friend who was an electrician once told me that all mechanics think electricity is magic. To which I replied, "Yes! And we don't like it".