Harness = Manual transmission
Per the link I put in there it seems that there is a difference in the wiring loom of the red and black top harnesses. One grounds out to the intake manifold(redtop) and one needs a ground point to the ECU(blacktop).
The engine and harness are all out of a early blacktop MT as far as I know (is there a way to verify this?). The chassis is a 1973 240Z, but that has no bearing on my issue as the engine and ECU are totally separate from the chassis wiring.
I know my alternator is not working as good as it should as I only get 13.06 when charging engine on, (read via Nistune and/or NDS) and I know it should be high 13's to 14.
Can you think of any tests I can do to rule anything out? I already tested continuity for the signal wire and both ground/power wires from the O2 sensor plug on the harness side. All check out good.
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