Our Piper PA28-181 doesn't want to let us communicate via its own intercom panel in the dashboard. We connect via the pilot port and an "Intercom SL300". When connected there is a annoying sound on the phones, it seems to be the strobe or ignition (going to test it).
- Where would I get information regarding the intercom/audio wiring in old and small airplanes?
- Is it possible to install a suppression capacitor?