In that case, if you get a chance just check the circled area. I will see if it makes sense, sometime, but I will have to dig out the books to do it.
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Just back from a weekend break and starting to look into this. To begin with, I think your idea will work, but I didn’t want to tell you to go ahead and find out later that you destroyed your TCI based on my recommendation.
My TCI circuit drawing is based on some assumptions, one of them being how the side stand relay interacts with the TCI module. The side stand relay is missing from my bike. Looking at the four wires connect to that module, I made an assumption. I still think it is the correct assumption, but I have no way to test it myself. Of the four wires there is L/Y which is the ground signal from the side stand switch(ground when sidestand up) and R/W which is +12v. These two wires probably energize the relay. The B wire is chassis ground which probably gets switched through the normally closed relay contacts to the W/B wire which goes to the TCI module. In other words when the sidestand is down, the relay is de-energized and a ground is switched through to the TCI, disabling it. When side stand is up, the sidestand switch is closed energizing the relay, opening contacts, removing ground from TCI, allowing it to work.
None of this info is in the Haynes or Chilton manuals and when I was skimming through the Haynes manual last Friday to see if I missed anything I came across a reference saying the TCI module sends a voltage to the starter cutoff relay (chapter 7,sect 26,para 5). This threw me for a loop and I needed to reread this a few more times. I believe this is a mistake. The cutoff relay is getting power from the AC gen not the TCI.
Finally, I looked in the operators manual that came with the bike. They refer to a “Ignition cutoff circuit” controlled by the sidestand. I believe this is an accurate description of this circuit. Unfortunately they don’t show it or describe it in the manuals.
If you are going to hook this up, do it through the Ignition cutoff circuit(sidestand relay). Your way will probably be better than having a cheap switch down near the sidestand, contaminated with oil and dirt.
I am pretty sure of the wiring of my TCI module, but I will check it again when I get a chance. Keep in mind that there seems to be different versions of these modules out there.
When I get time I will post a diagram of the Ignition Cutoff circuit, or at least how I think it is wired up.
Send me some pictures of your work