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Overvoltage when throttle - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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YOUR RESEARCHOvervoltage when throttle - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Leading reported evidence

Replace battery ground cable in case

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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.

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Performed · outcome unconfirmed · Original poster

Throttle body is new, VR is new and i just changed the battery ground cable in case that was the issue.

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Overvoltage when throttle - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Replace battery ground cable in case' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace battery ground cable in case' (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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Compare 2 other evidence results

Test by any decent alternator shop

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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 performed work without a confirmed outcome
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.

Performed · outcome unconfirmed

The regulator controls what the out put voltage of the alternator is, I seriously doubt it is the alternator, but you can have it tested by any decent alternator shop.

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Overvoltage when throttle - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run voltage drop tests across all the grounds

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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

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

If you suspect that you have grounding issues, run voltage drop tests across all the grounds.

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Overvoltage when throttle - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace battery ground cable in case

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.

Performed · outcome unconfirmed · Original poster

Throttle body is new, VR is new and i just changed the battery ground cable in case that was the issue.

Original post Read captured discussion
Overvoltage when throttle - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run voltage drop tests across all the grounds

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

If you suspect that you have grounding issues, run voltage drop tests across all the grounds.

Original post Read captured discussion
Overvoltage when throttle - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Test by any decent alternator shop

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.

Performed · outcome unconfirmed

The regulator controls what the out put voltage of the alternator is, I seriously doubt it is the alternator, but you can have it tested by any decent alternator shop.

Original post Read captured discussion
Overvoltage when throttle - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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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.

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

  • 986Forum: 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: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hey all! Everytime i press the gas pedal from idle in my 986 2.7 M96.23 , i see that the voltage spikes and sometimes goes over 14.8 even 14.96V. Throttle body is new, VR is new and i just changed the battery ground cable in case that was the issue. Alternator's output seems fine at all times (load/no load). When the system gets increased electrical load on idle (e.g AC on, radiator fans) it struggles (falling to 500 rpms) and then recovers. Seems like electrical issue but still trying to figure it out. Any input would be appreciated!

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 666838

Bosch Voltage Regulator is brand new. Any chance this is being caused by the alternator somehow ? Or by a bad ground somewhere ? Im running out of options

POST 4Original post

I would also be inclined to see the regulator as the cause of this symptom

POST 5Original post

Quotes source post: 666851

The regulator controls what the out put voltage of the alternator is, I seriously doubt it is the alternator, but you can have it tested by any decent alternator shop.

POST 6 / ORIGINAL POSTEROriginal post

Quotes source post: 666865

true.. What's the next thing to check ? Maybe the Regulator cant "see" the correct voltage of the system due to a bad ground ? 1. Bad starter ground, even though car starts perfectly fine 2. Bad alternator mounting ground (where it bolts) ? 3. Other ECU/electronics ground im missing ? Any other electrical side worth to check ?

POST 7Original post

Quotes source post: 666867

If you suspect that you have grounding issues, run voltage drop tests across all the grounds.

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