[embee]

3 other places where curvy wiring harnesses chafe. Probably not your issue from the description, but worth knowing and checking.
The wiring loops round a frame bracket inside the pillion seat cubby area, left side of the bike towards the rear. Check for chafing.
Both rider's seat bolts can be too long and hit the harness conveniently running just behind them. Check both sides. These are the ones holding the seat on, remove the triangle black panels to reveal them.

I suspect more likely Bibs is on track.