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Low voltage on gauge, 2001 996 Conv.

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4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

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YOUR RESEARCHLow voltage on gauge, 2001 996 Conv.

Leading reported evidence

Replace regulator, mounted

Suggestion or failed attempt

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion
You could replace the regulator, mounted on the back of the alternator, with a new one.
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Low voltage on gauge, 2001 996 Conv.

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Leading evidence: 'Replace regulator, mounted' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace regulator, mounted' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Suggestion or failed attempt

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion
Most healthy charging systems will start initial charge at ~14.2 volts and only drop off to ~13volts after extended recharge run time.
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Low voltage on gauge, 2001 996 Conv.

Frequently discussed actions (2)

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Replace regulator, mounted

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
You could replace the regulator, mounted on the back of the alternator, with a new one.
Original post Read captured discussion
Low voltage on gauge, 2001 996 Conv.

Run time

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Most healthy charging systems will start initial charge at ~14.2 volts and only drop off to ~13volts after extended recharge run time.
Original post Read captured discussion
Low voltage on gauge, 2001 996 Conv.

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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

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0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T213932Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi guys, I have a strange problem with my 2001 996 Convertible. When I start it cold the volt gauge reads around 13.5 V, which I guess is pretty normal. However, when I turn on the litronic lights I loose 0.5 V, and when the engine is at working temp I loose almost another volt, meaning the gauge barely reads 12.5V. This is really strange, and I am afraid to be left stranded some day. Does anyone know what might be wrong? I would guess it is alternator related, but if anyone could be more specific I would be very grateful. Regards, Johan

POST 2Original post

Most healthy charging systems will start initial charge at ~14.2 volts and only drop off to ~13volts after extended recharge run time. How old is the battery? If it is more then 3 years it might be time for a new one. From the symptoms you describe it does sound more like an alternator related problem. You could pull the alternator and take it to an auto electric shop for testing and/or replace it with a rebuilt unit. You could replace the regulator, mounted on the back of the alternator, with a new one. The brushes that wear out and cause many of these type problems are part of the regulator. The Bosch alternators are used on other makes and parts are available through many channels. The one on my 2004 Mercedes ML is the same as the 996. These are some regulators that fit the one in our cars.

POST 3Original post

Quotes source post: 10386599

I'm with Frank that the alternator is at least suspect. But before I went to the trouble of removing the alternator I'd have the charging system and battery checked out first with the alternator left where it is.

POST 4 / ORIGINAL POSTEROriginal post

Hi, thanks for the replies! Just to add some more info; the battery was my first suspect, so that one is new since 2 weeks. It seems to be holding up so far. Regards, Johan

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