After the batter you will have 12 volts. Prior to that the altenator should be around 13.8 volts. If you are under 13 volts it is probably on the verge of giving out. A company will almost always use 14 volts for there tests.
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 2003 Maroon Alero GLS Sedan. (Purchased new in 2003 with 18 miles, and sold in 2006)
2004 Toyota Corolla LE (Purchased new in 2003 with 87 original miles)
2007 Toyota Camry LE (12 original miles)
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