Converter Lock Up Harness

[qu1cks1lver56]

So after seeing a couple posts about lockups, I got to thinking I don't really notice mine working, so I did the push the breaks @ highway speeds test and it didn't unlock and lock again. So I looked under the hood, and there's a wire coming off the harness on the vacuum switch that has a plug on it, and nothing's plugged into it. I'm not sure where it's supposed to go but I thought maybe this might have something to do with it. Is this extra wire supposed to have constant/switched power? It has a red/orange colored plug.