I'm giving up on the truck being the issue.
13.5v max without the trailer hooked up and driving.
12.5 v max hooked up and driving.
12.5 v is a good number.
1 ohm at the brake terminal in the trailer cord.
That equals 10.4 amps. I read it should be 15-16amps
Then the magnets math out to be about 4ohms each. I read they should be 3.2 to 3.5 ohms each.
If I had 5amps more, the brakes would sure grab better.
Please point out if my math, or numbers are wrong.
I give up, the brakes are good enough
Looks like the truck is putting out enough voltage.
Maybe the trailer is the trouble. How I got two brand new trailers in a row with the same issue is sure high odds. I don't know why I didn't win the 1.6 billion!
Thanks for the help campers.
I'll wait until I find someone with a hitch and a Ford controller and let them pull it.
Again, sorry for stealing your thread Rock.
Now back to Rock's problem.