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2006 granite 700


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My truck blew a steer driver side had it all repaired but I have no brake lights on any trailer hooked to this truck. All wires are hooked up wiring harness from the fire wall to the trailer plug are good. So my question is what am I missing is there something in the dash a air pressure switch maybe. My first Mack besides a 79 model 10 wheeler. Any help would be appreciated. 

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