Mattax said

if you go again, get a copy of the test print out.
Without that we don't know what the test(s) consisted of, so can't jusdge the results.

See Dana's comment about the fuses in the regulator.
(you can remove cover and check those on a mechanical regualtor)
Also, to better understand why that blew the fuses, look at the sticky titled Identifying Chrysler Alternators.

That should eliminate the likely blown fuse in the VR.

IF this was tested at same time as when the battery positive was 12.3 Volts, this suggests a signficant amount of resistance between the battery positive and the mainsplice, or poor grounding.

The voltage at that terminal should be very close to the same as the supply voltage.
IF these measurements are all done at the same time, same conditions (engine running, alternator not working), this is a useful diagnostic.

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