Hello, I got a question I about this 1987 TII wiring harness on my project car. In the Haynes book and web sources the clip to the back of the alternator from the harness is said to have A black/white wire and white/black wire running from the clip to the ecu but I think this one has a black/white black/red? Anyone know if this is just a difference in this year? I'll probably be running new wires since black/red is already broken and they're really old so if anyone knows a source I can find where the alternator wires are supposed to attach to the clip that pugs into the ecu so I can verify I'd appreciate it.





Close up on alt wires


Current shape

 

passenger side kick panel clips

Traced the black/red and it went to the X-16 connector, or atleast that's what is called here http://grannys.tripod.com/2F8instructions7.html .From there it looks like it might head out to the alt warning light relay in the FSM but still no idea why the wire color was b/r instead of b/w.

 

you may have luck with wire colors in the Wiring manuals at Foxed.ca .

 

Thanks, Misterstyx. I'll check it out over there.

 

Just in case future readers come across this I think I found my problem. It was in another thread. I didn't point out before I'm doing a NA to Turbo swap for my S4 since I didn't think it would be a problem. My guess is the alternator wire on the harness was a hacked together NA harness used on my old Turbo car.


From the thread I just found


"No. You use the stock non turbo harness on the turbo engine. It's named the EM harness if you ever bothered to read the wiring diagrams.

You do what was suggested above in another post. You go to the FUEL AND EMISSIONS section of the FSM. You look at the CONTROL UNIT pages for the Turbo and non turbo cars. The CONTROL UNIT section lists what each wire does coming and going from the ECU. As you compare the Turbo pinout vs the Non Turbo pinout of wires, you readily see that there are but two significant differences b/t the two engines.

If you don't use the Twin Scroll solenoid to control the Twin Scroll Actuator, then it's almost just plug and play with no real differences.

If you use the Turbo EM harness on the non turbo car, then right away you lose the two wires that control the alternator (they are not in the Turbo EM harness but ARE in the Non Turbo harness). So you have to deal with those wires first of all. FYI: The alternator wires on a Turbo car are in the Engine harness, not the EM harness.

Then there are several other wires in the Turbo EM harness that don't mate with the right wires at the two plugs of the non turbo Front harness. "


https://www.rx7club.com/2nd-generati...wiring-749237/

 

For clarification the EM harness (orange plugs) are what attaches to the front harness on the side of the kick panel while the engine harness is what connects onto the ECU box under the kick panel or am I misunderstanding?

 

I actually wondered that and was gonna post that you may have to run a separate wire from the Big nut on the alt to the Batt +.(I forget what they label it as..sorry.All I know is that it is a nut and not a connector)