I'd use a digital multimeter across battery posts, everything off. The generic spec for a full charge is around 12.6 volts.
Also, check the purple wire at the starter solenoid S terminal, should be hot with key in the crank position. The info I looked at was for cutlass ciera 3.1L engine. Note the diagram.
Thursday, January 12th, 2012 AT 6:57 PM