I just installed a 585c(trolling motor) and a 787c2i(console) on my Nitro NX882 bass boat. I wired both graphs together on a direct feed from my main battery and zip tied the wires up to the main wiring harness. I'm getting some 'feedback' on the main graph when running above 2000 RPM's. The transducer is mounted level on a 'lower' transom where my boat picks up water for the live well. My main transom goes down 16-18 inches and then goes straight towards the bow for 16 inches and then drops another 6 inches. This is where the transducer is mounted. I turned the noise reducer to maximun 'High 3' and alot of the interference went away but there are still broken up vertical lines. Should I put the power wire in conduit, change to resistor plugs(if NGK makes one for a BU8H) more the power wire, wrap up the transducer wire, all of the above. I posted on BPS forums but found this site which better for bassfishing info.  Thank you.  Rick

Try separating the power cable from the rest.  I'm not sure about your application, but I know that in a car if you run speaker wires along side a power wire you can hear the alternator whine(static).