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This is my new Eagle 480 sitting on the bow of the boat. You can see the ugliness on the screen.

Transducer is on the trolling motor.

When I took this picture all leads to all batteries were disconnected except for the power wires spliced into the power cord of the finder (at the bow) from there - 16’ feet of 16 gauge twisted pair is running to the cranking battery at the back.

As a test, I picked up the finder and the transducer cable and stood as far away from the boat as possible and still got this interference in the picture. I was getting 12.5 V at the splice up at the bow. No idea how I’m getting interference with only the finder plugged into a battery that’s 16’+ away. Also ferrite cores at the power going into the finder.

Thoughts or test to run?