Problem finally solved. Went to Master Hitch here in Houston and within minutes two guys were working on the trailer and Tow Vehicle. One guy took apart my carefully required 7 pin plug and started working it like a rubric cube. Wires coming off and then reassembled in the correct order. They rolled up a portable diagnostic cart that had all of the car light functions on it so they made sure the car was good then started testing the trailer wires. It was like a pit crew at the races. Then one man moved to the tail light and replaced the bulb and worked on the light fixture. Then did the license plate light and marker lights. They would have fixed those if I had time to leave it. And now electric brakes are 100%. So lesion is to hire a pro on these things. It’s great to drive around town with turn signals, brake lights and everything working. Master Hitch gets 5 stars from me.
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