Lee,
A system Voltage that low with the engine running ... is positive evidence of a bad alternator or Voltage regulator, and a sure case for pulling the alternator and taking it in for testing and rebuild! All of our cars need a big, expanded scale Voltmeter ... clearly marked with Yellow from 13.0 to 13.5 Volts, RED below 13.0 Volts & above 14.5 Volts ... and your case is just more evidence!
__________________
Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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