I asked the Triumph dealer if they would connect the Starcom Digital power cable for me as a pre-delivery request (so it would be connected when I collected the bike for the first time). The dealer obliged and asked if I was OK with me if the power cable was connected directly to the battery. I said, that as the cable has an in-line fuse built in and the unit only turns on when the rider's helmet cable is connected, that I was OK with a direct connection to the battery.
Likewise, the dealer fitted the non-genuine R&G adventure bars for me.
At no time was I advised that fitting non-genuine parts to the bike would be in breach of warranty.
I think it is fair to say that before a breach of warranty has occurred, that there would be some requirement for the dealer to link the cause of the fault/problem with the result of fitting the non-genuine part having been fitted, eg. customer fits non-genuine cam, subsequentlly, the enging ceases - clearly, a warratny claim is going to rejected.
HD tried it many years ago, when the USA court held that if HD is not going to honour a warraty claim becasue a customer did not use 'genuine' HD engine oil, then HD would have to supply HD engine oil to customers free of charge - as if!
Let me use this example which I think demonstrates the point, if one fits a sticker on their bike which states, "I've been to hell and back" and subsequently the engine fails, I would hardly think that Triumph would get out of a warranty claim on the basis that as the sticker is a non-genuine item, a non-genine modification has been made. On the other hand, if the paint where/near the sticker has been placed starts to peal away, then Triumph would have a good case to tell one to take a hike if a warratny claim is made for poor paint workmanship.