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Cazz	08-02-2019 02:57 PM

Stupid 911 Gen/Alt light question

When I crank and let my 911 idle my alternator light is on. If I increase the idle speed above 1000 rpms the light goes out. Is this normal? So does this mean that the alternator is not charging with the light on at below 1000 rpms and starts to charge at above 1000 rpms?

Sebscst

08-02-2019 04:24 PM

Yes. Normal.

manbridge 74

08-02-2019 06:25 PM

Year of 911 would help but yes some early 50A alts could cause a faint glow at idle. But by the 80s there should not be a light on. When the carbon brushes got worn down on mine it started glowing strongly at idle only.

Cazz	08-04-2019 10:46 AM

Manbridge. Jeff. It is a 74 911 with cis. There is a rebuilt 55 amp original Marchal alternator mounted.

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