I'm on the same boat with you with dealing with electronics issues left behind from the previous owner/s on a sr20det s14 swap. My battery was swap behind the passenger seat, for whatever reason, I don't know. I think both power and grounding cables are being ran below the chasis and into the cabin. My battery seems to get drained, and even with a jump from my other car, it doesn't want to kick on most of the time unless I get it completely charged at autozone(99%). (I don't hear the fuel pump prime in the fuel cell in the trunk). So could be some issues there.
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