Alternator/Control Unit or Regulator??

If all you did was switch the wires AT the coil (not the battery) it should not have hurt the regulator.

Make a couple of simple checks

1--Turn key on, engine off, and hook your meter from the blue alternator field connector to ground. It should read "same as battery."

2---If this is good, remove the green field wire at the alternator, hook a clip lead from that field terminal and start the car, gently bring up RPM while watching the ammeter. It should charge more as RPM goes up. Don't get carried away

if that is good,

3--Next hook the green wire back up, and devise a way (machine screws) to jumper across the two terminals of the regulator connector after removing it.

Now remove the BLUE field wire and ground that field terminal at the alternator.

Once again, the system should charge if RPM is brought up.

4--If all the above checks out, you have shown that the regulator/ field wiring is pretty much OK, and the alternator is at least showing some output. Now remove and inspect the regulator mount, clean the firewall and regulator flange, and re-install using star washers. Pull the connector and work it in/ out several times to scrub the terminals, and inspect both the connector and regulator terminals for corrosion. Hook everything up "normal" and try once more. If you don't see a charge, replace the regulator.