What is the wire?

[SunSoaked]

I recently rebuilt my steering column and added the pulse delay function. I had a weird issue with the wipers not working in the delay mode and the wipers sweeping whenever I touched the stalk. I was sure it was a ground issue but couldn't figure it out so I left the module out for now.
However, I notice in these photos I found online, that there's a larger black wire (red plug on end). Anybody able to tell me what that wire is for? I don't recall having that wire on mine. All the guts in my column are brand new AC Delco stuff if it matters.