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 Post subject: battery/generatoor warning light
PostPosted: Tue Mar 31, 2020 11:17 am 
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Joined: Tue Mar 31, 2020 10:44 am
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Hi all, newbie member here (peter) with a little problem I hope someone can help with.

My 2004 997 runs fab but the red warning message keeps coming on only after about 15 minutes driving - "battery/generator fault".

So, have had both the battery (less than a year old) and alternator checked. Battery is 100% fine, alternator is at 13.9 I'm told should be 14.4? When parked up for a few days still starts with no problem and other than an annoying beep and the warning light coming on it drives great. Seems to make no difference if I turn fan/lights/radio off - thought worth a try...

Only comes on after I've been driving for a while - 10-15 mins, so maybe only when engine up to normal temperature.

Does anyone have any ideas what may be causing this?

Most obliged in advance - I look forward to meeting up with you when the madness has receded.


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 Post subject: Re: battery/generatoor warning light
PostPosted: Tue Mar 31, 2020 2:04 pm 
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Joined: Sun Nov 04, 2007 8:43 pm
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I know you've had it checked but smells of an alternator issue to me. Possibly a regulator with a heat issue.
It will still charge OK but may put the light on.
Alternatively, it could be wiring issue on the loom. But they normally don't do temperature faults.

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 Post subject: Re: battery/generatoor warning light
PostPosted: Tue Mar 31, 2020 4:47 pm 
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regulator or rectifier in the alternator

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 Post subject: Re: battery/generatoor warning light
PostPosted: Tue Mar 31, 2020 5:45 pm 
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Joined: Tue Mar 31, 2020 10:44 am
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Thanks for the replies gents. Sounds logical - especially as the battery is still charging and it doesn't appear until warmed up.
Most obliged. Pete


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