Hopefully there's some help here...
Audi V8q, 1993, 4.2
Battery drain is rapid- admittedly the battery could be part of the issue, so not eliminated yet.
System voltage, engine running, is about 9-10v, unless the rpms are raised, to achieve circa 12v+. then all seems well.
No charging light when the problem occurs, but the light is working.
The drain/low system voltage can result in ignition system failure.
My immediate thoughts were poor output from the alternator- I've seen something similar with my silver V8, which was alternator failure. However, the current owner has made mention of some device behind the instrument cluster, which has been an issue before, and replaced before, which is connected with this.
i'm nowhere near this car or my machine to look at this further.
Pointers please
