I've got a Lowrance HDS 9 - Gen 3 touchscreen unit in my boat and wondering what all I need to use it out on the ice. I know I need the blue connector ice transducer and have gotten that, but my main issue is power. My buddy is running something similar, but his power is running off DC, I am preferring to run mine off a 12V battery since I'm usually not sitting in a shack or in my truck. I picked up what I thought was the right power cord for this from my local Cabelas, but there are 3 different cords coming out of the one blue plug in. Can I just cut off all but the red/black power? Or do I have the wrong cord? Any thoughts or help would be much appreciated.