Hmm... perhaps the hackjob wiring under the dash is to blame for the lack of charging. The dummy light never lights when the key is in the "1" or "2" position... or when the car is running... from what I've read, that means there is an issue...

Alternator is doing nothing... battery voltage doesn't change at all when the engine is running.

I'll start tracing wiring tomorrow before having the alternator rebuilt.