I noticed one of my brakes not working once in a while then I would move the wires and it worked-poor connections. I totally rewired my brakes with heavier wire using a star pattern and then grounded each brake individually-most rigs are wired with a common ground, if you lose the common ground you will have no brakes at all. I was able to eliminate many connectors that were used at the factory and they all needed to be replaced. I used heat shrink connectors.Now their is only 2 connectors per lead that feeds one side of magnet. Brakes work much better. I use an amp meter to check the amps at the magnets. On a new trailer you can take it back, but I would have to fix it myself to be satisfied it was done right-good luck.
