THE MAGIC WORDS
"I re wired all the parking lights a while ago"
Lose a multiple ground or part of one and the fun begins. The reverse lamps are an indicator to others behind you that you aren't going to go forward or even stay still.
Yank your reverse lights fuse and see if you can finagle them to come on using various switching. Yank your tail light fuse and see if you can get the reverse lights still come on. Something is powering the reverse lights to come on and try to use reverse circuit troubleshooting to identify the interloper.
