Just get the trailer off the ground, spin a tire, then jumper in (with alligator clips) some voltage at the proper pins on the connector. You could also do it hooked to the rig. But, let me back up...you're saying that the magnet froze in the energized position, applying the brake constantly?
Right off the top of my head, that sounds like an issue with the internal lever/linkage mechanism not releasing properly. I can't imagine how a magnet would remain energized with no voltage being sent to it. (For you trailer brake experts out there, check me on this: Brake controller gets brake signal from vehicle circuit, and applies voltage (varying depending on deceleration needs and settings) to the brake wire to the trailer. Brake wire connects to (generally) the four brake magnets, and then grounds. Magnets energize, linkages force shoes to drums, trailer slows, correct?)
So, I can't figure out how you were applying a constant source of voltage to that ONE brake. And that you repaired it with no electrical changes. I suspect the problem wasn't the magnet, or maybe I misunderstand your description.
You're lucky to find the right parts so quickly. I redid mine recently, and did the same thing...replace it all. It was actually cheaper to get the whole shebang, and easier too. Since you replaced everything, I bet you replaced the real issue.
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