I am going to upgrade my TM this winter for next year. Plan to upgrade to either a 24volt TM or run 2 12 volt batteries to my current TM. Either way, I need to run larger wiring from the batteries in the bilge area to the bow. Currently I have what looks like either 12 or 14 Ga wire. Tiny wires. I am reading that I need to run anywhere from 8ga wire to 2ga wire. What size is really needed? And how do I attach wires that are that big to the plug? It is about 18 feet of wire each, both positive and negative. ??