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Message: [QUOTE="mikeeg02, post: 1372448, member: 24194"] The biggest difference is the wire length. The longer your wire, the bigger it's going to have to be when you're drawing a lot of power, like a 7.3l does when starting in absolute cold. My choice in what he should do is my opinion based on my experience in DC wiring and math, and what his desire is and complaints are in starting in absolute cold. Could you get away with smaller wire, probably. But his wish is for optimal battery life, and optimal starting when it's so cold outside that he needs to run his glow plugs for 3 minutes, (which use in excess of 80 amps if the glow plug relay is good) and then crank his motor while the glow plugs are also running, with two significantly larger batteries. That are significantly distanced apart. Keeping in mind that he also wants his batteries to live for several years. To do so optimally you would draw from them as equally as possible. When paralleling wire, voltage drop is half. Because each wire sees half the current. [/QUOTE]

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