I have recently acquired a 2008 LMM dually and the integrated trailer brakes are not functioning. I have no fault message, which is what most of the research I have found says occurs when they are not functioning and I am able to adjust the gain on the brakes but when connected to the trailer, I have no output. I am not very skilled at tracking these types of issues down so I am looking into some insight. I have purchased the relay that is under the spare tire but have not replaced that as of yet, plan on that this evening. No wires I can see in the back near the trailer connector have been cut or spliced but I did find an old brake controller stuffed under the drivers side dash but the wires to it were not connected. Any insight would be appreciated. Thanks in advance.