Question:

I have a 1992 Dodge Shadow America.  It has 114,200 original miles.
The probelm started with the "Check Engine" light coming on.  Then
all of gauges, (battery, oil pressure, temperature gauge) went haywire
and the battery indicator guage showed the battery was charging and it
was obvious as the lights got dimmer and dimmer and all of the
indicator lights came on one by one as I was driving (check engine,
air bag, oil light, etc.).  I took to my mechanic and  had a new
alternator put on. (A rebuilt one).  That was a month ago.  Now it has
started again.  The gauge shows the battery is constantly charging and
the check engine light came on again.  Any idea what may be causing
this?  What could possibly be the problem?