• Helix 7 mega di

    I installed new mega unit on bow I am using
    xtm 9 hw mdi 75 t external transducer on ultrex.
    Problem is when I am on 2d it shows bottom
    as zig zag 3/4 inch up and down. I have it plugged into
    bus block under bow on ranger rt 188 it s only supposed to draw only
    800 mill amps . Is it not getting enough power or ground?
    one other thing I have excess transducer cable rolled up in foot tray is that ok.
    Also excess power cable rolled up under deck .
    Just put ultrex on boat the gps puck is on bow center next to
    trolling motor if that makes a difference maybe interference?
    J. D.