This is my first time dealing with any kind of wiring harness so bear with me, please.

Does anyone know if its possible to use a TII wiring harness on an NA? I have the wiring harness (Emission Control Section) with me and the wiring diagram book to reference (1988 Diagram). I'm not finding certain connectors for the NA Diagram but am finding connectors from the Turbo section which doesn't make sense to me because this wiring came with the car when I bought it.

On top of that, the downloadable diagrams from Rx7club doesn't fully match with the books turbo section, so thats even more confusing.

Thanks

 

i'm pretty sure people have gone the other way, NA harness on a turbo, so its probably possible.
maybe a couple pics would help?

 

This Diagram is from the downloadable one here, and its the Turbo section since it doesn't have an NA section
The wiper motor, actuator, and sub-zero connectors are there on the physical harness

Black is Wiper Motor, Clear is the Sub-zero, and the Clear with green wire is the Actuator connector.


In the book I was able to find the sub-zero, but it was in Fuel Pump & Sub-zero assist System section, and not the Emissions Control System section, but The actuator and the wiper motor I haven't found in the book for both Turbo and NA, maybe it's just in a different spot in the book? If so why is it

Probably just answered my own question

 

you did, the wiring diagram is by system,

 

For your question regarding t2/na harness compatibility, j9fd3s is correct, most people who do t2 engine swaps in their na cars use their na harness and do some simple modifications.

its been ~10 years since I modified a s5 na harness for my s5 t2 swap so please search for the details. But I remember I had to lengthen the the tps connector wires, and maybe for one more sensor. I think I also had to swap 2 pins at the harness at the ecu connector for the boost control solenoid to work. I think those 2 pins were for 6 port actuators on the s5. I also don’t think the s4 t2 had a boost control solenoid and s4 6 port actuators are actuated via vacuum, so this should make it easier for a s4.

 

Thank you both for the help, I was able to understand the book better today. Got the emissions and engine harness mapped out, for the most part, even tho I'm missing some connectors

 

People get confused on that downloadable diagram because at the end of it, it shows a perfect wiring diagram but only for the turbo models. So maybe call it laziness.

For NA you need to go through each system and itll show you the wiring diagram, plugs, and where its located on the NA or Turbo models.