Posted for Mark Steitle <msteitle@mail.utexas.edu>:

Randy,
 From my understanding of the "typical" Ford charging system, it should be between 14.8v - 15.2v.  To verify this, you can have it bench checked, or put a voltmeter on the "B" terminal with the engine running.  This will show you the charging voltage at that moment (based on charge state of the battery), not max voltage.  A bench check would be best.  There are external regulators that are adjustable, but I don't know which ones.   A little research would help here.

Mark S.