Pendant coupling Omega B

I need a quick help. I just installed a trailer coupling and also wired everything with the plugs. But I have 2 cable connectors with one cable each and don’t know where to put it. One cable is white and very short goes straight through the hole in the sheet metal where the 1 plug sits for the hook-up and the 2nd is blue green or so and goes with it to the rear light where the other Stekers are. where do they get it?? Does that have anything to do with this, too, my Brem And the control light for the turn signals doesn’t work when blinking. Otherwise, everything goes as far as possible. Thanks for the help Andre