Hi everyone, forgive me I know very little about this. I'm in the process of updating my electronics. I am going to have a Hummingbird Helix on the bow and one on my console. I'm going to by a Sea clear harness and hook them up. Then run to a dedicated lithium battery. My question is the leads will be run to perko shutoff switch, from seeing this on Youtube. Does the wire jumper leads from the perko switch to positive to positive and negative to negative on the Lithium. In simple terms is all I have to do is connect straight to the lithium or do I need to run a ground wire somewhere?