After reading some reviews off the website
Sounds like the instructions state you have to run the turn signal wire to the front of the truck.
The wiring instructions leave a great deal to be desired. It requires 5 wires to work. One for the left turn signal, one for the right turn signal, one for the break, one for A+ voltage (constant) and one for ground.
I contacted the company asking for clarification on the wire schematic provided, I received an email that looked like it was written by a third grader instructing me to run two wires to the front of my truck and attach to my turn signals. I responded to this with a message asking if they were joking? They responded back and repeated the first message and also instructed me to run a wire to my third break light. This is on a Dodge 2500 RAM.
For a couple of dollars more, they could have added a logic circuit to the bar and done everything properly. It's a really poor design.