I'm looking for some advanced ideas on troubleshooting alternator noise. I searched the achieves and have not found anything that works. Here are my details:
RV10 with IFR panel
Plane power 60A main alternator
High pitch noise that stays at constant pitch but gets louder with load
Existed since day one with new PP alternator
Noise is eliminated when main alternator is turned off
Noise is eliminated when ps8000b intercom is turned off
Noise is eliminated with b&c backup alternator and zeftronics regulator
Both alternators go to same main bus copper bar
All jacks have isolation washers
Adding the lonestar alternator filter at the PP alternator did nothing
Any ideas for next steps. Right now i'm thinking of returning the PP alternator, or adding an inline filter to the intercom. Any ideas for a light and inexpensive filter? The ones for sale look both heavy and run $100 plus. Given that the alternator filter did nothing, I'm hesitant to spend more on filters.
RV10 with IFR panel
Plane power 60A main alternator
High pitch noise that stays at constant pitch but gets louder with load
Existed since day one with new PP alternator
Noise is eliminated when main alternator is turned off
Noise is eliminated when ps8000b intercom is turned off
Noise is eliminated with b&c backup alternator and zeftronics regulator
Both alternators go to same main bus copper bar
All jacks have isolation washers
Adding the lonestar alternator filter at the PP alternator did nothing
Any ideas for next steps. Right now i'm thinking of returning the PP alternator, or adding an inline filter to the intercom. Any ideas for a light and inexpensive filter? The ones for sale look both heavy and run $100 plus. Given that the alternator filter did nothing, I'm hesitant to spend more on filters.