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Trailer Brakes Lock Up When Connected To Trailer Using 6 to 7 Pole Adapter


I purchased 68 airstream overlander with Kelsey Hayes magnetic brakes. Bought a 7 to 6 plug adapter to connect trailer to 2019 tundra with controller built in. When I plug trailer up to truck brakes on trailer energize and won’t release until I unplug from vehicle.


Helpful Expert Reply:

The issue you are having with the trailer brakes locking up as soon as the trailer connector is plugged in has to do with the pin out of the trailer side trailer connector in relation to the adapter. The most likely problem is that the battery charge line is crossed with the brake output circuit. In order to fix this you will simply need to just swap out the two wires on the back of the trailer side trailer connector or you can just rewire a new trailer connector on the trailer using the Bargman 7-Pole Round Connector part # 54-67-525. I prefer the new trailer connector as it eliminates the need for an adapter which can cause issues down the road.

helpful expert reply by:
Conner L

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