I took all 3 of my trolling batteries out last night to replace.. I bought this boat last year, so it is, as it came.
Everything was pretty normal until I found one negative lead going from my 1st trolling battery to the negative post of my cranking battery. I had never seen this before.
Is this common for any of you guys? I'm assuming they are trying to ground that connection to cause less interference for the front graph possibly?