My inspection, as best as I could considering the location of the durn thing, is that the one corner terminal toasted just a little, but it caused a complete stoppage. In Wyoming I took the spider off and tried to scuff it to see if that would make contact, but it didn't. See my post where I went to the dealer where my bike was, still dismantled and dead, and I took a length of wire from my pocket and stuck one end under the S4 spider and wrapped the other end to the frame and the bike started right up. I provided a direct path from S4 to the frame. Art's harnesses don't do that exactly, but they take away most of the load going through S4's one corner wire.
I don't know if the dealer left that jumper wire connected that I used to "jumper" S4. Come to think of it, if that S4 ground wire is corroded and not making contact, and then I plug in Art's harnesses, it should still not run, yes? Art?? Once that corrosion is enough to break the connection it is now an insulator.
I wonder if my jumper wire is still attached to S4 and the frame? I'll look tomorrow.
By the way, the dealer called me and said he had two OEM harnesses ready to install. They were completely surprised as the main harness is still on back-order, yet there it is. While we were talking I found out the Yamaha Rep was in last week. I don't know what a "Yamaha rep" is or does, but the dealer dragged him right back to my nearly dismantled bike and gave him the story. They said he said little and took some notes. I asked if he looked surprised about the S4 situation and they said he acted like he was paying attention while they spoke but they got the impression he already knew what they were telling him. I wasn't there, just relaying what they told me. New wiring harnesses go in on Monday.
And I just realized this is in the Group Buy section - shouldn't it be in the problem section?