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2003 VT1100C Spirit
689 Posts
Yeah, I'd be willing to bet a nickel that circuit board is some sort of aftermarket oscillating/flasher thingy. Is it possible that you can contact the previous owner to verify what it is? There could be a wireless controller that goes with it or maybe it works off a phone app...or maybe there's a controller switch somewhere...

Also, you can download a shop manual (available somewhere on this site) for your VT1100C2 that will have a wiring diagram in it. Should be reasonably easy to bypass the mystery circuit board with the help of the wiring diagram.

Honda likes to use yellow/green wires for the "hot" lead on the brake light. They also gang up the brake light, flashers and horn into the same fuse circuit.

Good luck!
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