ABS and BRAKE lights stay on?

[ABeach6882]

Yesterday for the first time I was pulling a trailer with brakes. When I purchased the truck the previous owner installed a Kelsey Hayes trailer brake controler. I tried to test it in the driveway and it wouldn't lock the brakes up on the trailer so I tried adjusting the sensitivity. When I did I saw a spark inside the box and then noticed my abs and brake light on. Also now the door/headlight on/ key in ignition buzzer no longer works. It sounds the buzzer when I apply the brakes if the door is open though. Now when I apply firm pressure to the brake pedal the abs and brake light on the dash go off. I've disconnected the buzzer for now because it was driving me crazy. I've tried disconnecting the battery as well as disconnecting the connector to the RWAL box in hopes of it resetting the system. Ive also tried to run the diagnostic on the abs system. I don't get anything when I ground out the diagnostic connector. Any ideas as what the problem may be and how to fix it?

[CumminsPower59]

Sounds like you need to check how that brake controller is wired in and go from there.