[kimlangley7]

2012 Porsche 991.1 / ~68,500 miles/ Over-voltage issue – 15.3v at 2500rpm

Had a disturbing drive this morning – driving out to a Porsche shop in Ashburn to discuss some issues on my 1980 911SC – I noticed that the voltage gauge was climbing – past 13.5v…. past 14v.. up to 15.3v. NOT GOOD.

After discussions I drove back home – voltage stayed in the 15v range and I parked it. Started to troubleshoot the issue. Pulled up Pelican – then Rennlist – and all I could find are issues of undervoltage – nothing about overvoltage.

As noted car has ~68k on the clock and still has the original battery as far as I know = 8 years old. I am third owner – got it in Mar 2019.

Car starts just fine – but after a brief period – maybe couple of minutes voltage climbs from the 13v range – to 14v to 15v. I understand that it really should not go past ~14.7v in normal mode – [I don’t use sport mode that often].

I checked the battery with a multimeter after car had cooled down some – it was 12.45 at rest cranked it up and it went to 13.4 immediately and quickly rose to 14.7v within 2 minutes.

Battery is Duralast Platinum. No external signs of swelling or battery acid overflow.

?? Question: Is the voltage regulator for the 991.1 similar to that of the 996? 997? – where the voltage regulator is a separate sub-component? Or is it more integrated into the alternator?

I have no warning lights – just the reading of the voltage on the instruments.

What do you think?

kgl