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head and dash lights dimming

Electrical and Electronic

Vehicle Information: Model: 911 cab.; Year: 1984; Body Type: Convertible; Engine (type, size, modifications): stock 3.2; Total Mileage: 49000;

While driving lights and dash lights .will all of a sudden dim up and down which for some reason make the dash seat belt like turn on.Cars starts and runs fine.Could this be possible alternator or voltage reg. problems. This is my first time asking a question so hopefully I have explained the problem.Thank you

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