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Old October 20th, 2018, 5:37 PM
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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.
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Old October 20th, 2018, 5:47 PM
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Old October 20th, 2018, 8:51 PM
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The schematic I posted is for a 2006 Express 3500 6.6 Duramax. The OP asked how the diesel version was wired.
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Old October 20th, 2018, 10:44 PM
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I'm planning on doing the same thing on my 1995 G-20. My question is what gauge wire do I run from the relay to the 2nd battery?
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Old October 21st, 2018, 3:35 AM
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It depends on how long the cable run is, and how you plan to use the battery.
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Old October 21st, 2018, 12:34 PM
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Last edited by dberladyn; October 21st, 2018 at 12:57 PM.
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Old October 21st, 2018, 1:05 PM
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