Narrowed this problem down a little more but I'm still stuck. Got ferrite ring cord from humminbird and still didn't fix problem. Narrowed it down to the transducer. Tried 2 different transducers and they are both doing the same thing. Have the cord away from the whole unit but when I touch the cord to the motor housing or even put the clamp against the housing in getting interference.
Put the cord in a rubber hose and wrapped the motor housing in a rubber innertube that I cut into a long strip and then clamped the transducer to the housing. Still making rf noise on my screen.
I can hold my transducer an eighth on an inch away and it will stop as long as nothing is touching the housing. Same with the cord. But I can touch the bottom fin with the transducer and it's ok. Changed out the armature in the motor, same thing. Even tried rotating the housing just a little and same thing.
Any thing else that anybody know of?

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