Replaced factory cluster w aftermarket. Turn signal issues

One more thing while I wait to be able to get back out to work on it some more - can anyone confirm what this black wire is for that went to the original cluster? (It’s the furthest to the left in the photo) Best I can tell from my diagram the only black wire here was for some kind of voltage limiter. If that’s the case is it ok that I didn’t hook it to anything when I wired my new harness in?

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