The International Cessna 170 Association

Bob, if you decide to run shielded wires to those LED lamps, ground only ONE end of the shielding to the airframe to avoid a “ground loop”. I don’t know that will resolve your noise issue, but a shielding “ground-loop” is often an issue in audio circuitry.

Thanks George!

Shielded wire helped but didn't eliminate the problem. Turns out it was a known issue from Whelen for 14 volt systems and they sent updated bulbs which solved the problem.

Bob

rnealon1 wrote: ↑Sat Dec 30, 2023 3:53 am Shielded wire helped but didn't eliminate the problem. Turns out it was a known issue from Whelen for 14 volt systems and they sent updated bulbs which solved the problem.

Bob

Thanks for that Update!

Also check polarity, had that problem on friends cub, swapped polarity and radio noise disappeared.LED lites were not the Crazy priced STC articles,