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When my 1978SC did this it was the voltage regulator failing allowing charging to rise to 18 volts. Suggest you measure output voltage of alternator. I did this by buying a plug-n voltmeter for the cigarette lighter.
Roy
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1959 Bristol 406 (bought in 1972; sold in 1977)
1966 Porsche 2.0 coupe (bought in 1977; sold 1981)
1978 Porsche SC coupe (bought in 1993)
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