Electric brakes

I have a mystery here I hope ?? someone can help me with. I replaced two of four brakes on my trailer.. Everything worked fine when I started. Now I have a brake disconnected error code from my controller.
I connected the new brakes to the line using butt connectors and shrink wrap. I checked the pig tail, the wire from the bus bar to the magnet and ground. I have continuity to all of them. I ran a new line separate from the original and had brakes for about five seconds and got the error code again.
I’m at a total loss here. Any ideas? Anything would be appreciated!!!!
Thanks!