Im having trouble with my trolling motor causing graph interference i have a mk fortrex 101 with no sonar and a humminbird 958c and im running 4 batteries. I was going to run a ground from my starting battery to one of my trollers and my question is i have read on here to be sure to run it to the number one battery how do i know which one is the number one? Humminbird also reccomended running a ground from my starting battery to a screw on my trolling motor. If thats what happens to work could i not use one of the bolts that bolt down my motor or would i have to go to my motor itself? The boat is a 2011 puma ftd
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