Which alternator 60A or 46A?

Years ago I did the ammeter bypass, added a 2nd parallel path heavy gauge wire (with a fuse link) from the alternator stud to the starter relay's battery stud, put the headlamps on relays, etc...

Recently, I drove the car to work and everything was fine. Then, after work the volt gauge was sitting at just over 10V. Raising the rpms did not increase the voltage.

All of my connections are clean and tight (I like to use dielectric grease). After lots of measuring/testing (using my battery and my buddy's known good battery) I believe the alternator is toast. I performed the "full field" test (at idle and at higher rpms) and neither battery showed a voltage increase.

Has anyone seen or tried this on a non-adjustable voltage regulator?