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My rule of thumb ; - at idle the alt should be at 13.6 or better , with full 14.5 at 1500/2000 rpm - as for amperage if you are stuck in traffic , and your alt is rated at 100A , that 100A is available at 2500 or so RPM and up.
A 7 year old optima is probably running on borrowed time, but if it holds a charge , keep on using it.
If you need further help , we would be happy to see you.
Steve
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Steve SPF 2734 MK3 / Brock Coupe #54- panavia.com
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