Could use some help. My fish finder/chartplotter has been cutting off when I am running the boat. It's progressively happened more frequently until the other day, it cut off for good. Using a multimeter, I've got power at my console, and the only connection between that and the fish finder is the attached photo. I'm pretty sure it's that cylindrical thing in the middle. Can't find the name of it. In any case, I'm not seeing it with Lowrance parts, and if it comes with the whole transducer setup, none of the product images show this thing. Can anyone shed any light on this? I guess another question, whatever it is, do I need it? Can I just rewire without it? Thanks for bearing with me on this, I know I sound ignorant.