2006 Dodge Ram 3500 electrical system problems

While driving I heard a popping sound followed by smoke, burning plastic electrical fire smell, pulled over and found the orange wire next to the 100 pin power distribution block under the dashboard smoking. Upon further investigation I found that the harness rests against the metal emergency brake cable holder and had chaffed through, as well as the blue wire next to it. This orange wire is a constant hot and had began to ground itself out on the bracket.

I have a 2006 3500 single wheel with 30,000 km(19,000mi). I narrowly escaped a serious accident yesterday. I was turning left from a busy road and was being followed too closely by a fully loaded rig carrying steel coils. I put on my signal and began to slow down to allow the approaching traffic to clear before I continued to turn left. I watched the rig come up on me quickly and I realized he was not slowing down and was beginning to veer into the oncoming traffic lane.