Home > Technical (L322) > Momentary Alternator Fault - should I be afraid? |
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alanm_3 Member Since: 19 Feb 2011 Location: my House, unless I’m not at home, in which case I’m somewhere else. Posts: 6715 |
I had similar and it gradually started happening more often and eventually it came on permanently at which point, I replaces the alternator and all was ok, so I would suggest you might be on borrowed time. Got - 2017 SDV8 Autobiography in Loire Blue
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10th Feb 2024 8:37pm |
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RR2B Member Since: 04 Aug 2020 Location: Rowlands Castle Posts: 249 |
Thanks alarm_3, not what i wanted to hear! Surely alternator should last longer than 3 years? Fault came up again three times today and cleared almost immediately. Dodgy connection somewhere? 2011MY 4.4TDV8 Autobiography Baltic Blue
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14th Feb 2024 5:16pm |
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RR2B Member Since: 04 Aug 2020 Location: Rowlands Castle Posts: 249 |
Update - still getting these pesky codes popping up. After careful monitoring established the following:
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31st Mar 2024 3:06pm |
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AJGalaxy2012 Member Since: 11 Jun 2018 Location: Gainsborough Posts: 1464 |
it may be as simple as sticking brushes inside, easy to check/fix once youve got the alternator off, the latter being the bulk of the work. Yes it should last a lot more than 15,000 miles. It is also possible as you state to have a broken control wire etc.
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1st Apr 2024 4:50am |
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RR2B Member Since: 04 Aug 2020 Location: Rowlands Castle Posts: 249 |
Two 90 minute runs over the last couple of days and no fault codes to be seen. Gotta love these self fixing cars! 2011MY 4.4TDV8 Autobiography Baltic Blue
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1st Apr 2024 5:23pm |
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AJGalaxy2012 Member Since: 11 Jun 2018 Location: Gainsborough Posts: 1464 |
Like most things in life, if it sounds too good to be true it usually is. The alternator fairy may be having an Easter break BMW i3 Electric Car
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1st Apr 2024 7:22pm |
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RR2B Member Since: 04 Aug 2020 Location: Rowlands Castle Posts: 249 |
As predicted, the fault has returned after the Easter break. Still not dropping below 13.7V when the fault appears, car still running, battery still charging. What could possibly go wrong ...? 2011MY 4.4TDV8 Autobiography Baltic Blue
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10th Apr 2024 3:29pm |
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alanm_3 Member Since: 19 Feb 2011 Location: my House, unless I’m not at home, in which case I’m somewhere else. Posts: 6715 |
A lot Got - 2017 SDV8 Autobiography in Loire Blue
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10th Apr 2024 8:04pm |
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steve k Member Since: 05 Apr 2024 Location: Berkshire Posts: 19 |
If your car has any kind of intelligent battery management system used I would look there for the culprit. Voltage dropping to 13.7 every time could indicate that the battery management unit has an intermittent connection to the alternator regulator. When this happens the regulator defaults to 13.7volts which is more than enough to fully charge a 12v battery without damage. Current: 2003 TD6 HSE. 161,000 miles
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11th Apr 2024 8:15am |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3170 |
Heed the warning signs - get a new alternator 2012 TDV8 Vogue (L322) |
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11th Apr 2024 8:47am |
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RR2B Member Since: 04 Aug 2020 Location: Rowlands Castle Posts: 249 |
Thanks, makes sense. Any idea where the bms is located? I'll have a poke around in the battery area for any obvious dodgy connections. JayGee - thanks, if the alternator was original I would not hesitate to get it replaced, but given that it is less than 4 years old (and a 'proper' one was fitted) I am reluctant to go to such an expense until all other avenues are exhausted. 2011MY 4.4TDV8 Autobiography Baltic Blue TVR Griffith Alfa Romeo Mito QV |
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11th Apr 2024 9:50am |
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steve k Member Since: 05 Apr 2024 Location: Berkshire Posts: 19 |
It will be connected to the battery terminal/s. I'm not familiar with the type used on your model.
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11th Apr 2024 9:57am |
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alanm_3 Member Since: 19 Feb 2011 Location: my House, unless I’m not at home, in which case I’m somewhere else. Posts: 6715 |
…..but in the end you’ll probably still replace the alternator. My first replacement, that I did myself, as I did with the latter one, in the middle of winter some years ago, “only” lasted 3 years and it was a “proper” one, so it’s all down to fate, not time
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11th Apr 2024 12:42pm |
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RR2B Member Since: 04 Aug 2020 Location: Rowlands Castle Posts: 249 |
Update - had a fiddle around with the battery monitor unit connectors, and I've been fault free for over a month now. Thanks steve k for the pointers. 2011MY 4.4TDV8 Autobiography Baltic Blue
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8th Jun 2024 5:57pm |
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