No, the order doesn't make a difference, just that it has a good connection. The little white one is a funny little bastard. First time I blew a HG, I brok the terminal off when I pulled the head (didn't know it was hiding behind there) and didn't realize it. I saw the white wire lying there but just thought it was an unused wire...lots of those things around. So I just stuffed it behind the intake and didn't worry about it. No problems until a year or so later when I blew another HG. Did the fix and stuffed the white wire behind the intake and then had all sorts of problems. Finally tracked it to that wire. Apparently the first time I stuffed it behind the intake, it managed to ground itself against something and worked flawlessly for a year just lying there. Go figure.