Alternators are easy to test. Get a voltmeter and measure the voltage. It should be around 12 or so volts. Start the engine, and read the voltage. It should read around 13 or 14 volts. If not, it's likely the alternator.
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Chris Dennis, Plano, Texas
'07 Boxster, arctic silver, Tiptronic, 106k miles, no mods
‘13 Boxster S, black on black, PDK, 27k miles, garage queen
‘66 Mooney M20E, hangar queen
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