5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHAlternator whine
Leading reported evidence
Replace of note are
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
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Leading evidence: 'Replace of note are' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace of note are' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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Suggestion
I suspect I need/you need a ground loop but I don't know what to buy or where to fit and use the car so infrequently that I have not bothered to investigate so I am taking an interest in this thread bud...
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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
Not an issue for me as I don't listen to music in the car but annoying when using Google maps!
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
I suspect I need/you need a ground loop but I don't know what to buy or where to fit and use the car so infrequently that I have not bothered to investigate so I am taking an interest in this thread bud...
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.
5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T212127Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I've suddenly developed an alternator whine which means I have to keep my stereo (original head unit and amp) off to avoid broadcasting my engine noises! 2004 996 C4S.
The only recent changes of note are:
1. Had car restored recently including removing front quarter wings, cutting out rust and welding in replacements etc.
2. Had my alternator refurbished recently and installed it myself.
I've been looking into the problem a little including the possibility of a ground loop isolator (as a quick fix) but I'm not great with wiring/electrics.
I've been in touch with a car electrical expert who thinks the alternator is a possible culprit and wants to test it. It otherwise works perfectly.
Any thoughts gladly received. It doesn't look like an easy fix and i don't want to spend loads on diagnostics.
Dave
My 996.2 with Bose also whines when stereo on however my source fault is the Mr.Bluetooth module. Not an issue for me as I don't listen to music in the car but annoying when using Google maps!
I suspect I need/you need a ground loop but I don't know what to buy or where to fit and use the car so infrequently that I have not bothered to investigate so I am taking an interest in this thread bud...
Hi, I have the same Bluetooth module too but I never used to get the whine and I also tried removing it to no avail.
On the one hand, I'd like to be able to leave my PCM on, as I also have a SIM card and stream from my Spotify. On the other, there could be several hours of diagnostics needed to find the source of the noise which probably isn't worth it?!
My money's on a poor/missing ground secondary to bodywork?
I still haven't gotten any further with this issue. Still have the alternator whine which I didn't think a fibre optic MOST system was meant to do?
Just seeing if anyone else has a perspective on this. I can't seem to find an audio specialist in the east midlands that will look at it.
Wondering if installing a new alternator (in place of the repaired one) might be worth a go. I certainly can't justify going the PCCM+ option and want things to look original.
This is a source reference. Confirm exact model applicability in the original material.
