Looks more like a car alarm to me. On a standard 7 way socket Lt yellow , Rt, green Running brown, brake controller blue, charge red and ground white. Double check me on that. I just have mine wired for lights to the dolly for now but, I have to add a controller for my trailer brakes and charge.
'92 Gulf Stream Sun Voyager. Tweaked 5.9 Cummins, complete interior makeover (previous owner).