Helix 7 / Minn Kota interference.
Bow had a Humminbird 598ciHD which worked perfectly. Moved my Helix 7, power cord, and transducer to the bow, interference ensues.
I reinstalled the transducer that was attached to the 598. Same problem.
I reinstalled the power cord that was attached to the 598. Same problem.
I reinstalled the 598 as it was before I moved it. Now it has interference.
I haven’t touched anything else on the boat.
I tried the suggestion above. No luck. I give up.