Trying to add a OPT7 tailgate brake light on my 2019 f350 and I am running into a few issues. I have to hardwire the light since the truck has BLIS and this is where I am having an issue. With the ignition in auxiliary the tailgate light works, brake light, blinker, and reverse work fine. Here is where the issue comes in, I turn the motor over and the brake light doesn't work nor does the blinkers. Metering the connection I have about 11v both with the brake engaged and the blinkers activated but no output on the tailgate light but the brake and blinkers do work on the rear of the truck.
Any help would be greatly appreciated.