I tied into my ground wire going to my 787c2i and run a wire down to where i have the clamp around the actual trolling motor. I stripped some of the wire and loosened the clamp wrapped it around and tightened it back up and it took out 90% of my interferrence !!! I hope this helps you guys out. Hummingbird sent me their kit and it had a piece in it they said mount to the floor of the boat. That thing was huge !! There was no way I was gonna mount it in the floor of my boat. Thank goodness this extra ground did the trick for me !!