How old is the alternator?  New ones tend to have more brush noise than older
ones.  Is all the intercom wiring shielded (and shields properly grounded)?  I
would check intercom wire shielding and then put the biggest capacitor I can
find on the alternator output.
My experience .... Jim S.

DaveLeonard wrote:

> Now that the engine is running well, I have a new problem.  Alternator
> noise.  The intercom is the main problem (victim).  When the intercom the
> alternator noise is quite noticeable, even annoying.  The noise goes away
> altogether when the intercom is off (i.e., when using the radio without the
> intercom/audio panel).  If I turn off the alternator the noise mostly goes
> away, (I think the coils make a faint noise - but it is not significant.)
>
> The intercom/audio panel is the kit from RST.
>
> I was going to try an automotive filter on the power to the intercom.  Any
> other thoughts/suggestions?
>
> Thanks,
> Dave Leonard
>
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--
Jim Sower ... Destiny's Plaything
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T