I don't suspect the voltage regulator. I'm not a technician, but this is just what happens when an alternator is being overworked. Voltage has to drop because the amps are not there.
With the other cars of the world, you can drive into about any tire store and they will test your charging system free. I suppose they could still test 911s, but they would not see any wires coming off the alternator. I guess the load tester would be parked next to the battery.
Anyway, the first ting these guys say is the battery is weak and a fully charged, strong (new) battery is necessary to complete the test. They all say this, so either it is a worldwide hoax or it is true. With a good battery, they can tell if your alternator is capable of running everything. If not, it should be replaced/upgraded.
Be sure your terminals are all clean as a whistle and coated with Dow Corning 111.
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'83 SC
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