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Possible Alternator / Regulator Issue?

  • 1987
  • 944S
Mileage: 
47 900
Electrical
Boynton Beach, 
Florida

I am noticing the voltage guage dips when the AC cycles and sometimes I hear a "whistle or wine".  Is this a possible alternator or regulator issue or is this normal?  Still has OEM alternator installed from 1987.  Thanks!

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