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We just back from a 1500 mile trip to Washington and Oregon using the Tekonsha P3 aftermarket controller. During the trip I checked the wheel temperature several times a day and didn’t experience any significant temperature differences between the wheels. I do agree that logic would dictate that the problem is mechanical ie: over tightening. What contradictes this conclusion is that the problem surfaces using the OEM controller and doesn’t when using the aftermarket controller. I should also mention that the shop that first diagnosed the bad controller called the shop that did all the work on the trailer bearings/ axle and shared the symptions with them and they both agreed that it was a bad controller.
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