If diodes bank came out damaged, there are replacement kits. NOW, I'm not sure if any diode bank will hold the Tuff Stuff alternator output rate.
https://store.alternatorparts.com/partno605.aspxor diodes banks separatelly if just need one of them
https://store.alternatorparts.com/chrysler-square-back-rectifier.aspx( I bet there are cheaper sources for this )
they sell the same diodes bank for all their ( quickstart ) alt output rate kits
the next thing it could be damaged is the stator being some of the windings broken/burnt. The Stator can be checked but alternator needs to be dissasembled. Stator can be also replaced BUT I think this could be provided just by Tuff Stuff. This is the bigger difference on the alternator ouput rate.
Rotor can get damaged too simply testing for continuity between brushes and being isolated from chassis, But on this case you wouldn't register any kind of charge or voltage variation like you described making the tests.
