Have to try the ferrite ring because I've taken the transducer completely off of the trolling motor, taken the cord out of the coiled power cord and it's still doing it. The unit itself is about 12"away from the base of the TM. Unit works fine until I turn the TM on. It doesn't seem to increase when I turn the TM up on a higher setting either. Does radio shack have ferrite rings? And are there different kinds and sizes?

Sent from my SM-G900V using Crappie.com Fishing mobile app