Nice outcome on this one. Happy Days for the owner.
Good going guys! This shared knowledge thing really works.
Given this issue popped up when the bar risers got installed I guess it's a stretched broken wire and should be easier to find now that you know it's in the kill switch circuit. Broken kill switches are pretty rare, broken wires and bad connections less so.
We have had a couple of '02 R's and have repaired a few others from a broken wire right under the zip-tie location as it leaves the frame towards the controls. Acts like a hinge and really strains the conductors.Some have been way to tight on problem bikes.
I believe you have removed those a bit earlier in your quest.
H's worst one would stall when handlebars were turned all way to left( as in a gas stop/parking mode)... straight and bike ran.Was able to correct in hotel lot that evening by slitting already brittle loom covering and finding the pinched and easily pulled apart green/red or the companion. It had risers when we bought it adding to a bit more strain a that zip-tie I imagine.
Another one acted up in the rain...not an HES issue, but it was opening kill switch ckt as well. I could wiggle the bundle and cause the issue. Once again broken right at the former ziptie location