Starting problem is resolved. I took out the altenator and had it completely rebuilt at a reputable altenator shop. Altenator shop said the altenator was still good at 15 volts. But before rebuilding the altenator it was had to start the car; now I don't have a starting problem with the rebuilt altenator.

I tested the rebuilt altenator by connecting the voltmeter to the battery and with the car idling I get 14.4 volts.
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Idle problem: At idle, the tach needle drops below 500 rpm and then jumps up over 550 rpm, In addition, the headlights are dim then brighten up when reving the car at idle.

Idle problem solved by unbolting and cleaning IACV with carb cleaner.