Why are my newly wired replacement outlets not providing power?
Given little to work from - you replaced a bunch of stuff and you have either no or low voltage, or full voltage but &quot;nothing when you plug in&quot; - it all sounds like:
Poor Connections.
Might be all of them, might just be one bad one per circuit, but loose conections will cause all those problems. Where you have 120V but nothing works when plugged in, the 120V (at no current) is getting carried by barely connected wires, but they are so barely connected that trying to draw current makes the voltage at the outlet vanish, as it's all busy trying to heat up the bad connection.
You don't mention your methods of work - if you used backstabs, don't. Use the side clamp screws. If you used wirenuts, they need to be twisted a lot harder than most inexperienced people will do, and you need to check that none of the wires are loose after you twist them. Be sure that you don't have poorly stripped insulation between the wire and the screw/clamp.
If you changed wires at the breakers, you actually need a torque driver to make those connections properly to code.