You can tell your altenator is good because you can test all the circuits (cap, pot, rectifier, stator/rotor, diodes, ect) what you cannot do (according to the TM SMR code) is de-pot the solid state reg to test/repair the circuits, and it would be news to me to find out the AGARS has this capability. To my knowledge the test for a reg is go, no-go, verified with a known good, and they are non repairable (PAFZZ, should be PAHZZ, but who assigns these codes anyways....). I bet I know a few jarheads who can fix them though
Use the known good reg to verify, chances are your reg is bad, these alts are very robust. I can pull up the 34 manual for the alt but you need to get me the NSN or pn# for the alt.