The PL error code on the Primus brake controller # TK90160 indicates that power is interrupted when stepping on the brake pedal. Check the connection of the red wire. It should be attached to the brake switch wire that has power only when the brake pedal is pressed. If it has power at any other time then it is not the correct wire.
I have also included some links to testing and troubleshooting brake controllers that should also help. view full answer...
The most probable cause for not getting a display when you apply the truck brake, but getting a display when manually activate the override is a bad connection in the stop light circuit. The stop light circuit is the red wire coming off the brake controller that goes to the cold side of your brake pedal switch. It may still be working on the trailer in part because the inertia sensor may still be working in the brake controller.
I recommend using a circuit tester like # PTW2993 to check... view full answer...
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