Noise Suppressor for 182RG

[Let'sgoflying!]

A pal is having a hard time finding one, he doesn't have a parts manual.
Hate to call Cessna anymore without a pn.
Maybe they are all generic?
What would he need for his 1978 Cessna R 182RG with an O-540D?

He is tracking down a whine in the headsets, somehow they have eliminated the alternator but the mechanic is too busy to look further, he is looking for ideas as well.
Thanks

 

[SCCutler]

Dave, if the noise varies with engine speed, I still favor the alternator as the culprit, but I have no knowledge as to whether the noise suppression (can be as simple as a capacitor of appropriate size between hot and ground) is supposed to be internal to the alternator, as it usually is in automotive alternators. If not, then I would chase down where the fool thing is or is supposed to be, and replace it.

I used to be an ace at tracing down alternator noise in cars. But that was weeks ago.