While doing the overhaul on my bike I discovered a mystery part attached underneath the driver seat. It looks aftermarket as the screws holding it in place and the manner of attachment are very much not in they style of what Honda does. My best guess is that it’s part of an old alarm system. I am a little worried to hook it up to 12 volts to see what happens though. The last time I did that to a mystery siren I had my ears ring for the next week!
The unit says “Quorum” on the side. A little bit of googling shows that there is a company that manufactures alarms under that name. However I couldn’t find that company’s website or any photos of the siren.
Looks to me like a siren.
Wiring harness wasn’t connected to anything.
It was mounted where my finger is pointing. The two screw holes are visible just to the right of my finger. The pink wire in the upper part of the frame near the red fuse holder has the same type of connectors as the wire on the unit. That pink wire doesn’t go anywhere and was clipped. No evidence of any modification to the rest of the bike’s electronics.