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GLoBaLReBeL420 · 05-25-2017, 03:12 PM

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.

05-25-2017, 03:12 PM	#3
GLoBaLReBeL420 Leaky Injector Join Date: Aug 2005 Location: Orange,CA Posts: 117 Trader Rating: (2)	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.