alternator or voltage regulator on 2005 Saturn Relay

my battery went dead ,changed it.now my info center says charging system failure but it comes on and off. also battery volts goes up and down 11.2 -15.0.what could be the problem?

by in Charlotte, NC on December 19, 2009
1 answer 1 comment
ANSWER by on December 20, 2009
You need to inspect the data stream of your charging system. The Voltage regulator is now part of the Engine Computer, so first check your Alternator. It could be a bad rectifier, brushes, connections etc.
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COMMENT by on May 19, 2015
Unchanging this same issue I've changed my battery with a new one and replaced the alternator what could be the problem