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#1
26th July 2019, 06:02 PM
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Time for a new Alternator (Update: New Battery)
Well it seems to be the warm weather has upset the S8 a little.
Went to drive it today and it had a little trouble! Jumped it OK (Anker Jump Pack highly recommended as it starts a 4.2!) and drove from that point fine over a 20 mile test route. Started OK after that and seemed to be back to normal. Looking at VAGCOM I am only getting 12.5v when running on the measuring blocks (The 2.8 A8 gets 13.7v as a comparison), confirmed this also with the good old multimeter. It seems the S8 has lost a couple of vital volts when running. Battery is good (tested) and is in fact a reasonably new Yuasa Silver, so do not expect that to be the cause. Therefore it looks like a new alternator is needed to me. Now the old one has done nearly 199,000 miles so its best years are behind it and provided good service. What's the Alternator of choice? Euro Car Parts have a Lucas (150A Model - 401441231) one for £335 using there daily magic codes or CarParts4Less for £287. Though Gloucester does have a specialist that reconditions starters and alternators so may try that instead.
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-- 2001 Audi A2 1.4 SE - Jaipur Red Pearl 2002 Audi D2 4.2 S8 - Ming Blue Pearl 2002 Audi D2 2.8 A8 QS - Audi Silver -- Last edited by Nognar; 17th August 2019 at 12:29 PM. 
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#2
26th July 2019, 07:22 PM
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Make sure you get a V8 one. Many parts outlets sell the V6 one claiming it's the same as the V8. It'll bolt up, but the cooling air inlet is in a different place.
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#3
26th July 2019, 11:04 PM
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Thank you and good to know.
Last time I did an alternator was on a C4 2.8 Quattro
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-- 2001 Audi A2 1.4 SE - Jaipur Red Pearl 2002 Audi D2 4.2 S8 - Ming Blue Pearl 2002 Audi D2 2.8 A8 QS - Audi Silver --
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#4
27th July 2019, 10:37 AM
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Yuasa Silver battery? Don't commit to an alternator at this stage as I've had loads of issues recently. Let me dig out the thread and I'll report back...
(Too long, didn't read) summary - it was the battery, local auto electricians tested it and it was useless, 8.5V under 300 amp load.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend) 2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend) 
Last edited by johnny_quattro; 27th July 2019 at 10:38 AM. Reason: too long didn't read became emoticon due to semi-colon
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#5
27th July 2019, 10:40 AM
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Here's my thread detailing the problems I've had recently with alternator/battery/electrical distribution connector block on front chassis rail...
http://forum.a8parts.co.uk/showthread.php?t=15074 Hope this helps in some fashion.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend) 2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend)
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#6
27th July 2019, 01:05 PM
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Interesting read and thank you.
Seems the battery may not be as good as I thought. I will swap it round with the one in the A8 and do some further testing.
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-- 2001 Audi A2 1.4 SE - Jaipur Red Pearl 2002 Audi D2 4.2 S8 - Ming Blue Pearl 2002 Audi D2 2.8 A8 QS - Audi Silver --
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