I believe I have figure out the problem. I cut off the trailer plug on the trailer where it was spliced to the trailer wires and hook it up to my truck and tested for voltage on the leads. On the running lights I was getting no voltage and on the right turn I was getting less than a volt but when tested directly at the truck there was 12 volts. I tried cleaning the trailer plug connector but nothing helped. I am buying a replacement one today on my lunch hour and shall see if that solves the problem tonight.