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battery light flickers on 2003 Ford Focus

My battery light flickers on and off at all different times. Never had an issue until I had the alternator replaced a week ago. I replaced the battery less than 2 months ago and when I had it tested it was reading at over 14. What could be causing this? It is the middle of winter and I don't want to get stuck somewhere. Every time I try to take it to a place like Auto Zone to have them check it the light is never on.

Asked by for the 2003 Ford Focus
Check that the battery connections and connections at the alternator are clean and tight. After that I suspect an internal alternator problem. Looking at the diode pattern on an an oscilloscope and looking at the pattern "loading" the alternator may show up the problem.