Nognar - I still have a V8 alternator [Bosch] rated at 150 amps sitting in my hallway. A replacement was obtained from Prestige and was fitted to my car after experiencing charging problems with, you've guessed it, a silver Yuasa battery. I'm convinced it was working before I foolishly replaced it but haven't tested it.
If it can be of any use, let me know either in this forum thread or a private message. The only possible caveat being that the S8 alternator is different to an A8?
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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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