I had that problem last week when I hooked up for the first time in nearly 2 years. The brake wire to the trailer plug-in had broken. I noticed it after pulling out of my storage space. The shop that originally installed the plug-in 12 years ago was just a block away, so I pulled in and let them hunt it down for me. The charged me $38 -- well worth it! (I think it should have been more like $138, but I wasn't going to argue.)
Pour a can of Coke on the connections at the hitch to dissolve any corrosion. Then take a screwdriver and scuff up the pins a little to ensure you are getting the best contact possible. Then start checking fuses in the fuse box under the hood, check ground connection on the trailer. You can also open up the box where the 7-pig tail is connected to the trailer and check the connection in there.
You didn't say but if you have hydraulic disk brakes on your trailer, the IBC will not work as it will only work with electric brakes. There is a way to fool the IBC but it is easier and probably more relieable to just add a self contained brake controller (one designed for electric over hydraulic brakes. Catfish
K3500; Teton Homes 5er;
Native Texan - Transplanted Tar Heel
Retired USMC Mustang (LDO)
Semper Fi !
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