Besides the yellow ground, where are the wire # indicators on both ends of the UTM cable? Most of the wires on both ends do not have intelligible numbers that can be read or no numbers at all ?
I had the same issue. I had to ohm out both ends of the wire to do a proper install. Since they only use a few of the wires it didn’t take to long.
Each wire has small white letters. They are admittedly hard to read and could become rubbed off though. If you must, @bgmoon’s suggestion will help identify each wire.