Hi guys,
I've followed everyone's suggestions so far and still not even a dent, it's just as bad as when I started and nothing I do seems to improve the level of interference. Here's a video so you can get a better look of my setup and what I've tried. You can see in this video I have run a completely separate transducer, power cable and battery and I still get it. I've tried all kinds of grounding combos and yes the fuse in the TM head for the ground wire is fine. Have a look, tell me if you think I missed anything:
Thanks!
Dan