This is true for the adapter plug, but not for the cord feeding into the plug (at least on the newer models). I had cut off the adapter plug thinking there were only two wires feeding into it, one for hot and one for ground, that I could simply connect to the respective TIU terminals but after doing so I found there were three wires, despite the third position of the plug being empty. I guess my question is where to terminate that third wire outer wire, my instinct is that its redundant and should be connected to ground but I wanted to get a second opinion. I've attached a photo for reference:
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