started up began to idle rough all gauges, AC, radio, etc shut off

My van seems to be having electrical issues as it started up but began to idle rough and all the gauges, AC, radio, ect shut off. When I jumped it it began to run fine (AC, radio, wipers, ect). After removing jumper cables it almost immediately began to idle very rough and all electrical components shut off (no gauges or anything). It continued to idle very rough until I depressed the break peddle and it died. Before I tuned the key off, I began to hear a constant clicking coming from the steering column. I also noticed this clicking from the fuse relay box. The clicking stopped after I turned the key off. All of this took place after cleaning the battery posts. About a week prior I had the battery and alternator tested at Auto Zone in which they said they both tested "good". Thank you for any guidance you can offer.
Ryan adams