Alternator battery fault
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Alternator battery fault
I’ve had it come up twice on my dash in the mornings for about 5 minutes around 2 weeks apart that there is a ‘alternator fault - automatic stop/start system fault battery is not charging’.
This stayed on my dash with the battery light for about 5 minutes and has now gone away and not appeared back on my dash. Any ideas if this is a fluke or some dirt in the wires or something more serious ?
This stayed on my dash with the battery light for about 5 minutes and has now gone away and not appeared back on my dash. Any ideas if this is a fluke or some dirt in the wires or something more serious ?
AudiWorld Senior Member
Joined: Nov 2023
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From: Sweden
I’ve had it come up twice on my dash in the mornings for about 5 minutes around 2 weeks apart that there is a ‘alternator fault - automatic stop/start system fault battery is not charging’.
This stayed on my dash with the battery light for about 5 minutes and has now gone away and not appeared back on my dash. Any ideas if this is a fluke or some dirt in the wires or something more serious ?
This stayed on my dash with the battery light for about 5 minutes and has now gone away and not appeared back on my dash. Any ideas if this is a fluke or some dirt in the wires or something more serious ?
Report the figures here.
Seriously, I don't expect a serious answer to that.
I expect that people who cannot afford a multimeter for $15 will still believe it's reasonable to replace a generator or a battery for $400 without first measure the voltage with the multimeter!
These people will continue asking, yet refusing to listen! Go figure!
Last edited by JohnnyJ; Jan 16, 2025 at 05:46 AM.
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I hope you can help me out.
I'm not having any warning lights on my dash, but my battery died recently. The guy that replaced my battery suggested to check my alternator since it wasn't suppliying enough power to the battery.
My A1 2021, 3cil 1.0L has 12.6V with the engine turned off, and 13.15V with the engine working on iddle. And 13.6V with lights, A/C, Audio, etc turned on.
Those 13.15V on iddle look low to me. Any help is much appreciated.
I'm not having any warning lights on my dash, but my battery died recently. The guy that replaced my battery suggested to check my alternator since it wasn't suppliying enough power to the battery.
My A1 2021, 3cil 1.0L has 12.6V with the engine turned off, and 13.15V with the engine working on iddle. And 13.6V with lights, A/C, Audio, etc turned on.
Those 13.15V on iddle look low to me. Any help is much appreciated.
AudiWorld Senior Member
Joined: Nov 2023
Posts: 741
Likes: 88
From: Sweden
12.6V with the engine turned off is ok. 13.15V with the engine working on idle is too low, assuming the motor has been running for a couple of minutes.
Did you really buy and replace the battery without first measuring this voltage? You have replaced a perfectly working battery with another perfectly working battery. Yet you have not found why the alternator is only charging 13.15V.
Before changing everything else that is working perfectly, check the battery connections for oxidation, poor contact to ground etc. Do the same with the alternator with your new battery disconnected for safety. If you don't know how to do that, ask a friend or a friend's friend. It's not that complicated.
Did you really buy and replace the battery without first measuring this voltage? You have replaced a perfectly working battery with another perfectly working battery. Yet you have not found why the alternator is only charging 13.15V.
Before changing everything else that is working perfectly, check the battery connections for oxidation, poor contact to ground etc. Do the same with the alternator with your new battery disconnected for safety. If you don't know how to do that, ask a friend or a friend's friend. It's not that complicated.
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