If it was me, I'd put things back to 'before' by removing the bag controls from power and see if the dash returns. If not, then check wires and connections for that, since that's what's changed. If they return...you've found your problem. What I'm not certain of from your post...did you or didn't you change brake controllers? If so, then you need to follow that path as well. If all you did was move the old one to a new mounting spot, that shouldn't be a cause for any issues.
This is not meant as snark, but did you possibly bump the dimmer down?
This is not meant as snark, but did you possibly bump the dimmer down?