Wiring tail light question for you you all. I have the rectangle LED light with the "trailer light adapter" mod that was provided with the complete kit from FFR. The rear parking lights and turn signal lights work but no brake lights on either side. I have gone all through the brake light system looking for obvious lose connection and continuity. No issues identified. Purple brake light wires from the brake switch are connected to red brake light wire going into “trailer light” adapter. Brown wire on the output side of the adapter are connected to the tan wires (tail light feed) going to brake lights (I used the purple wires for light in truck). At the tail light connection I am getting 12 volts with the parking lights and the voltage does not change when the brakes are applied. I checked the voltage at the brake switch and I get 0.47 volts on the orange brake feed wire (seems low). With the brake applied I get 0.45v at the red wire going into the trailer light adapter.

Is the voltage at the red wire correct?
What input voltage does the adapter need in the red wire?
Has anyone seen the trailer light adapters fail?

Thanks in advance.

Brake light adapter.jpg