Clearly your alternator wasn't producing output. My suggestions.
1) Confirm that belt is tight or not missing.
2)confirm that Alt. FIeld CB or fuse in not blown
3) confirm you didn't accidently turn off the Alt Field switch
3)Check for loose wiring at back of Alt. Visual check may not be adequate. I have seen several people discuss problems with the connector provided by a certain provider's alternators (don't remember the brand but it was a popular one). May want to use a continuity tester.
4)check Alt output fuse, if you have one (blown fuse means you need to closely checking wiring for short and/or alt is also likely shot)
Do you have an external voltage regulator? If so, you can manually apply 12 VDC to the Field. If Voltage goes up, Alt is good. You need to be careful with this, as voltage keeps going up. However, it is more likely that your alternator failed than a solid state external regulator. safer to pull the alternator and have autozone test it for free. However, if you have one of the aviation alternators, autozone may not have a plug to connect to it. I don't use one so do not know if it is a standard auto type connector.
Good luck,
Larry