7 blade vehicle side trailer plug wiring question
 

I purchased a 2006 F350 cab and chassis flatbed truck that came equipped with a 6 pin trailer connection. When I went to change it out for a 7 blade 1 bhk flat in kanjurmarg connection, I found the wiring is bizarre - there is a long cable with the seven wires that runs front to back. It then connects to a splitter flats in ghatkopar where the 6 wires for the trailer connection come from one side and the wiring for the brakes/reverse/running lights/turn signals originates from the other side. new projects in dadar