Hello,
I was having an issue with our 7 way connection, sometimes loosing our right break light on the rig. The plug was shot, the overall install was a bit sketchy, yellow wire was just cut and left as is. Might be good idea for owners to unscrew your plug and have a look.
Wow, thanks for the heads up. That looks awful. Even if those connections were working, I suspect there is high resistance.
We were having problems with our old connector and swapped out to this style.
EZ Connector S707 Plug, Trailer Side
EZ Connector S706 Socket
JMHO