I wonder whether it is a bad voltage regulator. Put a voltmeter on the battery terminals and rev the engine up. Shouldn't get more than a hair over 14 V.
Long shot, but worth a try.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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