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1989 911 Carrera Alternator shut-down

Electrical and Electronic

Vehicle Information: Model: Carrera ; Year: 1989; Body Type: Coupe; Engine (type, size, modifications): 3.2L; Total Mileage: 130k;

What would cause an alternator to shut-off? Background: The car's Optima Red-Top battery was fairly discharged and was being charged by the alternator when it shut-off. (I have noticed that the Optima battery is a brute. When discharged, it demands significantly higher charging current to reach 14v than the Porsche recommended OEM battery.) The alternator apparently shut-off because of high current demand, causing the battery voltage to drop until the engine stopped. The alternator recovered after resting or cooling for about 45 minutes. Thanks.

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