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Message: <blockquote data-quote="Slappy" data-source="post: 343423" data-attributes="member: 7608"><p>[ATTACH]52482[/ATTACH]</p><p></p><p>Looking for ideas to track down this interference issue. Side imaging gets a washout effect when trolling motor prop is on. The photo shows a darker band which is the short interval I turned off the prop on the trolling motor to take the photo.</p><p></p><p>It is definitely electrical interference as evidenced by the immediate change when turning thrust on or off. There is no difference whether trolling motor speed is 1 or 10. It has nothing to do with the prop turning in the water as it does the same thing with the prop out of the water. </p><p></p><p>Minn-kota terrova 36v with 3 dedicated trolling batteries. Cranking/house battery powers everything else. The only physical connection between the trolling batteries and the house battery is the 4 bank pro mariner onboard charger. As those circuits are isolated, I wouldn't expect that to be the issue but I haven't tried disconnecting the charger leads.</p><p></p><p>The minnkota has US2, which I unplugged from the graph to confirm that connection was not the culprit.</p><p></p><p>The trolling motor power wires do not run anywhere near the transducer cable.</p><p></p><p>I am struggling to think of what else I can check. Any ideas or similar experience? Thanks.</p></blockquote><p></p>

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