Electrical Junction Wiring Help

[Lhinkle114]

Today I had to fix the clamp that holds the 7 Pin cable in place to the upfront junction box. When I removed the cover I noticed that there were two wires loose. There was a light blue and a black wire that came from the Rig side wiring that were loose in the box. I don’t know if they are suppose to be wired together or just loose. I have read up on wiring and do know that blue wires go to the brakes and the black usually a positive. There is already two thick blue wires attached to a thick black wire which I think is for the rig brakes so I don't know what these two wires are for.

I have attached photos of the loose wires and the already connected other blue and black wires

Any help you can give me would be great full

Thanks in Advanced
Larry