I have a 2016 Nitro z21 and have just put a helix chirp on front and a helix mega at steering wheel and as soon as I step on my new ulterx trolling motor I get bad interference I have placed the rings on both my power wire and transducer wires , humminbird replace the board in the foot pedal and motor and brushes I have run different ground wires put units on one battier and still get interference as soon as I touch my foot pedal . I pulled the transducer off the trolling motor and held it away from the trolling motor no interference as soon as I get about 3 inches from it interference again have no idea where to go from here any help would be great thanks