Originally Posted by
Dennis S.
I started getting interference on my Helix bow unit out of the blue. I checked and changed the 3a fuse, and it was fine. I installed ferrite rings, moved cables, and it was still there. I thought I isolated the trolling motor from everything, and realized the battery charger was the link between the batteries. I put a small plug in on the cranking battery leads from the charger, plug it in when I charge, then unplug. The graphs were then isolated from the trolling motor. Interference is gone 100%. Don't know if this will help you, but it might.