Quote Originally Posted by Pithon View Post
I was going to try aluminum foil between the transducer and motor housing but it still does it without even being connected to the TM. The closest thing to the TM is the unit itself and it's about 12" away. Didn't do this at all with the other TM. An EDGE

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The noise is generated by the variable speed PWM, so 5 speed motors don't do it. First troubleshooting step should be to operate the motor on 100%. If the noise is still present, your problem isn't RF.

I'm suspecting you have a power connection between your batteries. Tell us about your onboard chargers and your boat batteries and outboard.