Well done Don! Are you planning the tour pack auto lock next?
Sky, I'm not. In fact I didn't even look at the hardware kit for the leather tour pak to see if it would retrofit in to a hard tour pak. In my case my tour paks aren't on the bike unless I'm on a road trip. And even then I'm in and out of the tour pak seemingly every stop independent of the saddlebags. So for me it made more sense to keep the tour pak separate.
The wiring part would be easy. It's just the same wire pair that goes to each saddlebag. Doesn't matter how many times you split off that pair as long as the split is after the diode.
Simply don't have a clue on the tour pak hardware though. First reaction is that since the shape of the paks are so much different, and their latches are different, the hardware would not retrofit. But since I never even looked at a breakdown for it that's just a guess.
The saddlebags were obvsously retrofittable (hmm, new word?). Same shape bags and a bunch of the other latch parts stayed the same. Next time I'm out at the bike shop I'll borrow their manual for SEUC2s and look at the tour pak breakdown. See if anything can be guessed from the picture. Alternatively, next time I'm close to SEUC2 will eyeball the inside of the tour pak and see what the hardware package looks like. I'd not be optimistic for a direct bolt in retrofit for the tour pak though.