Also found this:
You can check for a bad earth (symptoms indicate this). Withe the engine running on idle measure voltage across battery terminal + 13.5V or more.
Then on a ramp check from big terminal on alternator to engine +13.5V or more. then check from Alternator terminal to chasis if there is more than .1 V diffeence you have a bad earth on eaither the engine earth cable or chasis earth from battery.
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .
Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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