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Message: <blockquote data-quote="jethro" data-source="post: 418785" data-attributes="member: 12381">I run both my trolling motor and Helix 5 off the same deep cycle battery and the wires run right next to each other for about 5 feet. My 25 hp electric start motor is also on that battery. I never noticed any kind of interference and I know my fish finder well. I personally would run all the wires under the floor so you don't have to run a heavy gauge trolling motor wire over the transom. Much cleaner under the floor and I would think you'd have to drill a hole in the rub rail for the wire which I would personally want to avoid.I used to be big into high end car audio when I younger, so I know all about interference when you run wires close to each other. But I don't think the fish finder works the same way. Nothing seems to interfere with my sonar signal, gas motor running or not, trolling motor running or not or anything else in my electrical system. I think that the amps drawn from the battery for a fish finder are so low that there is very little to no signal interference, but that is just my experience.</blockquote>