I realize this is a bit off topic but I'm needing some experienced advice. I recently bought a brand new horse trailer. I also recently had my 7-pin flat plug on my truck rewired. Hooray! Everything on the trailer works EXCEPT the brakes. I'm thinking it might be the brake controller. I drive a '97 Chevy diesel and it had a controller installed so I'm not sure of its history; it is aftermarket. There is power to it, but my trailer brakes don't engage and I can't use the manual slide to engage the brakes. I am skeptical to just take it to anyone, since I've had a lot of folks try to take advantage of me because I'm a young girl driving this old rust bucket truck. Soooo I want to have a pretty good idea of what I might need to do, before I take it to anyone. I am new to the area and don't know who's reputable or not. Has anyone ever changed out a break controller? I took a look at it and it appears to be hardwire (i.e. no pigtail) so its not exactly plug and play. Would I be able to just cut the wires at the old controller, remove, and then solder to the wires of a new controller? TIA!