I chased the blue yellow back to the board.
It goes to j122-4
I tugged it and it came off in a huge strand! It must have been broke off already!
I chased it back to the join,
Put it to gnd (braided wire, in the backbox)
Still nothing.
It's still connected on the relay board when I'm doing this, should it be?
I've tested this out of all settings tests and again with it on manual head test motor on