I did that already I'm getting power to it when I press the brake I checked the trailer brake relay as well and that's getting power to it too just no lights on the truck and trailer last night I parked they were working and an hour or so later I checked them again and they weren't working no one messed with the truck it was idling the whole time a couple hours later I woke up and pressed the brakes and they worked
2017 388 tri axle rear brake lights will not go out. Brand new chassis node, and going through the wiring now. Any help would be appreciated, thanks.
Like full brake lights or just on very dim? Brake lights can get turned on by the brake switch or the application pressure sensor. Both are located up by the rh side of the steering column.
I have a 2015 peterbilt 389 with trailer break lights problem. They stay on but tractor break lights work properly. If I tap on break pedal they come off sometimes. No dirt under pedal. Does anyone know if there's a relay or senor that might control that problem?
Is piston under pedal free in its bore? Hand valve fully released? Check the switch for the trailer brake lights. There is another for the truck.
Is the pedal pivot free? Lift the pedal, if it does not fall back down the pivot pin it is frozen. Next time lift the pedal to see if they go out.
It looks like that probably was the problem. It did fall back down but it didn't do it at all today. Thanks
