83 oxygen sensor engine bay connections

[echocanyons]

I have a 83 engine in my 81 SC.

There appears to be three wires that are associated with the oxygen sensor in the engine bay (not including the are that attaches directly to O2 sensor), These wires arise from the harness that runs in the cab and to the control unit, the same one that attaches to the multi-pinned harness on the back of the engine.

My question is what and where do these wire attach to, and what are each of the functions?

I understand that one may be power but I don't know where it attaches to, I also have no idea what th other two are and what they attach to.

I searched (under: oxygen, connections, electrical, sensor, sensor, CIS, control unit, smog and wiring) but haven't been able to find the answer...

Thanks!

[Vin-barrett]

pictures of these wires?

The O2 is only one wire but maybe I am not understanding the question.
I have an 83' if you need reference

[echocanyons]

Thanks for the reply, I am woritng of the harness that runs from the controller under the passenger seat and enters the front of the engine bay behind the engine. This harness gives rise to the ~12 pin plug that is attached to the front of the engine bay( behind the engine) and attaches to the plug that arises from on the engine.
There is also a ? fused connector that arises from this harness and has, I think, three wires one is red one is black and one may be green.

I understand one may be for interrogation of things. I will try and take a picture this evening.

[echocanyons]

Here is the picture, is the red wire supposed to go to power?
I have grounded the brown wire.

[echocanyons]

bigger pic

[LM3929]

that's the test plug, it's used to test the duty cycle of the frequency valve.

[echocanyons]

Should the red wire that is seen in the picture go to power? If so where?

[sjf911]

Originally Posted by LM3929

that's the test plug, it's used to test the duty cycle of the frequency valve.

[echocanyons]

got it! many thanks guys