9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBattery discharges overnight
Reported repair
Replace "y" cable
Reported resolution
1
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 report a fix
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.
Reported fix
Same car.............same problem.........my tech replaced the "Y" cable and problem solved.....it ties everal functions together and has a tendency to short out or corroded terminals are also a problem
Leading evidence: 'Replace "y" cable' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, the most frequently mentioned possible cause is 'diode in the alternator' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace "y" cable' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Replace "y" cable', supported by resolution reports in 1 discussions. 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 report identifying a cause
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.
Reported cause · Original poster
Turns out my problem was a bad diode in the alternator.
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 · Original poster
I was talking to a fellow auto enthusiast who's into British cars and he suggested disconnecting the alternator.
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
You need to test your electrical system for parasitic draws; requires putting a digital multi meter between the + post on the battery and the cable, letting the normal draw fall off (1 hr.) if you see more than 40-60 milliamp's, you have a drain.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Replace "y" cable
1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report a fix
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.
Reported fix
Same car.............same problem.........my tech replaced the "Y" cable and problem solved.....it ties everal functions together and has a tendency to short out or corroded terminals are also a problem
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 need to test your electrical system for parasitic draws; requires putting a digital multi meter between the + post on the battery and the cable, letting the normal draw fall off (1 hr.) if you see more than 40-60 milliamp's, you have a drain.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Replace "y" cable
1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report a fix
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.
Reported fix
Same car.............same problem.........my tech replaced the "Y" cable and problem solved.....it ties everal functions together and has a tendency to short out or corroded terminals are also a problem
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.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Pelican Parts: 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: 20261027T022239Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Greetings fellow Porschephiles, I searched the forum hoping to find an answer to my current issue with my 2000 996 C2 with 123,201 miles. It has killed 4 batteries since Dec. 2017 and I need to find the cause before I take the last battery back for a warranty replacement. I'm five weeks out from back surgery and won't be released to lift anything heavier than a gallon of milk until after Sept. 18. but I'd like to solve the problem before then if possible. Has any one had this issue and solved it, if so I'd love to hear the fix, and any and all input is welcome.
You need to test your electrical system for parasitic draws; requires putting a digital multi meter between the + post on the battery and the cable, letting the normal draw fall off (1 hr.) if you see more than 40-60 milliamp's, you have a drain. Then you pull one fuse at a time until it drops into range. Last fuse pulled is the circuit with the drain on it.
Good luck.
Thanks for your input. To answer your question, I do remove the key and lock the car when its parked in public, and remove the key but don't always lock it in my garages. I've pulled each and every fuse one at a time and none of them had and excessive amp draw. I was talking to a fellow auto enthusiast who's into British cars and he suggested disconnecting the alternator. He commented that its possible for one of the diodes to cause the battery to discharge. I've put a cutoff switch at the battery to keep it from discharging while the car is parked for any period of time between drives.
Again thanks for your input
^^^
What he said. These cars have a crazy amount of electronics that remain on even when the engine is off. To turn everything off you have to click the fob and lock it. Stupid yes but they all do that from 993 on up.
I had a similar problem on my 997. on 997 the horn sounds if something is amiss e.g. frunk being open. (which I was convinced was the issue- frunk light being on & horn was sounding when locking)
it wasn't.
after a forensic review of all lighting circuits I found the glove box light was permanently on due to a large button being lodged down the back of it- holding off the microswitch. this killed my battery.
hope it's of help
Same car.............same problem.........my tech replaced the "Y" cable and problem solved.....it ties everal functions together and has a tendency to short out or corroded terminals are also a problem
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