Recently talked about having mag noise in my com audio and got some good feed back.Well FOUND IT. With out going through a lot of detail lets just say troubleshooting was my life as a technician and Murphy was there making my day. Started at the magneto p lead.There were 2 unshielded wires,one one the p lead and one on the ground connection.The mag switch had the shielded wire and shield ground.Traced the wires from the mag and found the connection to the shielded wire inside the cockpit just forward of the instrument panel.And if that wasn't bad enough,the p lead was connected to the shield. The switch worked fine but the p lead was radiating through the shield as an antenna might. Replaced the entire p lead with a new shielded wire from front to back. The moral of this story is never take anything for granted.Tommy W.
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