7.3Ford said the key to the real difference. Both methods will work fine but figure 2 will provide the more even battery life. In figure one, one battery will end it's life much sooner than the other. In figure 2 both batteries will reach the end of life closer to the same time and there fore longer.
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Jim B
2017 Lariat F-350 FX4, CC, SB, 6.7 PSD 4WD
2018 MONTY 3731FL, at our private winter site in GA
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