Let’s clear up some confusion first:
The lights Im talking about are not your dash lights, so they won’t light up with the head lights on. They will only receive power with the ignition in the RUN position, so you need your key on to even check the lead on the alternator end to begin with.
If your dash illumination lights (the ones that are supposed to come on with the headlight switch pulled out) arent on, that’s another kettle of fish entirely, so don’t worry about those right now.
Put the cluster back in, turn the key to the run position, and check the field wire again. If you’re still having problems, check the gauge cluster power wires on the cluster connector. If those don’t have power, the problem is somewhere between there and the fuse panel.
Double check and make sure you’ve pulled the correct bulbs too, just to be sure.