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"Big 3" Update and 3.6L ESS Auxiliary Battery

tehfrr

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I want to update the cables connected to the battery to marine grade 1/0ga. This would be like battery to alternator, battery to ground, etc.

Normally this is straightforward but I'm trying to figure out what to do with the ESS Auxiliary Battery system.

3.6L ESS Battery Diagram

Thoughts on what portion of that system Id want to include if I'm going to be in there doing it?
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