A charged battery is 12.9 volts. Alternator is supposed to go over 14 volts. System voltage when the engine is running should never drop below 13 volts.
Try sticking a nail in the back of the alternator - in the Delco "test port." That's what it's there for. If the alternator is good, but regulator not working - it will go to full charge rate when you use the port. If nothing happens, then the alternator itself is bad.
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Today's Featured Article - Old Abe is Still Making Hay - by Jeremy Sweeten. Things have changed a bit since my last article. I am now almost finished graduate school at Purdue University. I am still in Agronomy, but specializing in hay and forages. My wife has survived two years of marriage to a part-time farmer. The equipment line up has changed a bit too. The DC has retired to
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