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I do not know what year that schematic is from, but I thought there were some isolators, or something in the circuit. I do know that the factory schematics vary, there are least four different versions that I have seen. At least I thought upon my initial study there were four different ones, even in the same year. I do know that for my year and the wiring system before it, you need to have the option to have the main secondary battery wire. I happen to have two factory ones here, but I am not interested in selling them. The factory wire goes from the secondary battery to the electrical junction box under the hood, not under the seat. Some schematics show different layouts, but none of them go to the battery box under the seat. Personally I think that would be bad as it would potentially allow too much current draw for that particular wire.
