For those with the Z21 pro with the 112 Minn Kota....I’m trying to decifer how the batteries are configured. i have 1 cranking battery and 3 trolling motor batteries. My question is where are my 2 Lowrance graphs pulling power? I have a 3rd garmin graph I put on myself for mostly mapping (I like the garmin map set ups better) but cant decide what battery to pull power from. I feel pulling power from one of my 3 trolling motor batteries will pull to much current and toast my graph? By the way....I know nothing about electricy and wiring so I could be completely wrong.