The head unit in my 2000 A6 just died , so I replaced it with an Alpine
CD player, connected up to the half-Bose system with autoleads
connectors.

With the engine running, I could hear a faint whining noise. Ejected the
Coldplay CD but the noise persisted - at engine speed, a very faint echo
of the noise you'd expect from an unsuppressed alternator. Not
noticeable with music playing, although you can hear it in the
background with talk radio.

I assume that the alternators on this age of vehicle have built-in
suppressors, and this interference wasn't evident on the original unit
when it was working.

One suggestion was to run an independent fused mains supply and earth
direct from the battery, bypassing the loom. Any ideas whether this
would work? Is this a known problem, and is there a known cure? I'm
not sure that fitting an external suppressor to the alternator is
going to be feasible.

--
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Pete Young pete@antipope.dot.org Remove dot. to reply
"Just another crouton, floating on the bouillabaisse of life"

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