I see a lot of complaints on the electric brakes not working on the 2021 F150's. I have recently had the same issue, the truck will say trailer is disconnected?? Brakes on trailer are not working. Did a voltage test and I have the 12 volts power supply but my electric brake voltage goes 0-6VDC. Is this normal in Park? It's very annoying driving down road with warning coming in and out about the trailer not connected. I see all these complaints but what to do? It doesn't sound like Ford will do anything about it!!