Finally went and did it
I made the mods to my (s.o.b.) that I had planned for the ole sunny.
I made a harness using 2 40A hella relays that join the 2 batteries together.
If I use the 'battery boost' button on the dash to start the chassis, it isolates the 2nd battery since the relays are after all 40a, and if I go on shore power, it isolates the batteries so my 2 channel, 10amp per channel noco super smart charger takes over, eliminating the 3amp charge circuit of the magnatek 6332
since the negative cable is full size 1ga, I can use the positive on one, negative on another setup when the batteries are connected such that both have the same resistance.
ideally, I would have liked to use 1 relay fired by the shore power condition that could handle the current of the boost circuit, BUT, who makes a 300+amp relay that fires on and consumes about 50-100ma?
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QuadDriver
1987 2461 behind a 1981 F100 and sometimes my 1990 F150
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