Trying to figure out what the wires running in the battery box go to. Got the boat from my grandpa about a year ago and he had all the batteries hooked up. Cranking battery and two trolling motor batteries. How ever there are two wires a red and a black that run in from somewhere to where the batteries are located in the back of the boat. There are two wires red and black that look the same that are hooked to the trolling motor batteries. What are the two wires that aren’t connected to anything for?