When I rented a uhaul 6x12 they made sure my truck outlet was working right, and they connected everything up.
I just checked my trailer, my ground is good. It has welded on stud, I took wire off and wire brushed and reinstalled. I just checked and I’m getting variable voltage from my brake controller. I removed 7 to 6 pin cover to access brake and gnd wires.
View attachment 809558Tires still not braking. I only have brakes on back axle on 7k trailer, but normally don’t haul much over 2k.
Sorry to crash your thread.