bypass the relocation and get some good power in there and see what gets power.
There are probably some blown fuses, but something has to be getting power, the hard part is figuring out where the power stops. Could be something dumb like the main ground is loose. Or it could be something annoying like bad relays.
and you can't rule out the possibility that you just have a whole bunch of stuff that has gone bad all at once.
I just got done working through one of those problems. a/c wouldn't work, radio wouldn't work, dash lights wouldn't come on, fog lights wouldn't work, and a few other things. Turns out, each one of them had a separate cause.
Usually this isn't the case. So when you hear hooves, think Horses, not Zebras. Just keep the Zebras in the back of your mind as you start ruling out the horses.