American autowire harness

cajones20025 · Mar 26, 2019

So I went about Buying a new dash harness from american autowire since there was an electrical short in mine and it got burnt up due to 20 years of bad repairs. Directs are pretty straightforward and idiot proof with pictures very very nice quality. My questions are for the ecu hookup and they are very confusing and american autowire was not able to help. They say I have to buy a stand alone system but I believe I can get my stock ECU to work along with my injector harness. My question is were do you thing I should hook these two wires into my ecu according to stock schematics. I would hate to half to buy another 1500 in A stand alone system. Between this and after market gauges I'm 1600 dollars in.
I believe I need key on power ignition and constant battery power. My fuel pump is not an issue because I bought an automotive fuel pump harness for that.

cajones20025 · Mar 26, 2019

My question is if you were to hook this kit up or if anyone has used this kit with stock computer for 87 to 89 how did they go about hooking it up for ecu connections. I know the stock dash harness connects to engine harness on passenger side.

cajones20025 · Mar 26, 2019

What wires to what on stock harness.

jrichker · Mar 26, 2019

cajones20025 · Mar 26, 2019

Have all them so I guess I need constant battery on pin 1 to ecm and I guess pin 30 is my ignition and wake up power

cajones20025 · Mar 26, 2019

There’s does not much of the factory stuff they followed it’s all there own. Prob gonna have to wing it. I know the .edu needs a constant battery power and key switch power which is pin 30 and Kapwr is 1. If I can’t figure it out might have to source a used dash harness. And keep this for later

jrichker · Mar 27, 2019

Edited 28 Mar @ 12:30 EDT
Pins 40 & 60 are computer Ground

DO NOT put power to pin 30!!! you will damage the computer!!!

Pin 30 is the neutral sense switch that tells the computer that the transmission is in neutral..

cajones20025 · Mar 27, 2019

jrichker said:
Pins 40 & 60 are computer power from the computer relay.

DO NOT put power to pin 30!!! you will damage the computer!!!

Pin 30 is the neutral sense switch that tells the computer that the transmission is in neutral..

So no power to pin 30 ok cool . So do I want constant battery 12v power to pin 1 because pin 40 and 60 are grounded until they get power once the ignition is turned on get power from computer relay. So I guess I hook up ignition feed to my EEC relay ?

jrichker · Mar 27, 2019

cajones20025 said:
So no power to pin 30 ok cool . So do I want constant battery 12v power to pin 1 because pin 40 and 60 are grounded until they get power once the ignition is turned on get power from computer relay. So I guess I hook up ignition feed to my EEC relay ?

That is correct. Check the ignition switch diagram I posted and you will find it there.

cajones20025 · Mar 28, 2019

Well good thing I check harness turns out i have an 91 to 93 harness started cross referencing stuff and my fuel pump relay is in engine harness and my ecm is a a9m which I believe means it's from a 5 speed vert. So have to tap into some different wires.

jrichker · Mar 28, 2019

@cajones20025
There was a typo on my post # 7;
Pins 40 & 60 are always grounded.
Pins 37 & 57 are power from the computer relay.

cajones20025 · Mar 28, 2019

That's on found
out my harness is 91 to 93 when I started pin checking.So I got schematics for 91 to 93.

cajones20025 · Mar 28, 2019

Got harness all wrapped up

Ponyboy506 · Jan 31, 2021

cajones20025 said:
Got harness all wrapp

sorry if I’m kinda late. But I just finished the same wiring harness on my 90 foxbody lx and I’m stuck on the same part (which is the last thing I have to do)
so the grey 12v in the run key position and the pink 12v in run and crank key positions both go to the ignition wiring and the 12v orange constant battery power is a loose wire that taps into the ecu pin 1?
i have looked everywhere for help and this is the closest I’ve gotten so anything would help! Thanks!!

1LoneFox · Jun 25, 2022

I’m stuck here as well, did you guys figure it out? I have a 1989 mustang gt with the A9L computer 5 speed

1LoneFox · Jun 25, 2022

Ponyboy506 said:
sorry if I’m kinda late. But I just finished the same wiring harness on my 90 foxbody lx and I’m stuck on the same part (which is the last thing I have to do)
so the grey 12v in the run key position and the pink 12v in run and crank key positions both go to the ignition wiring and the 12v orange constant battery power is a loose wire that taps into the ecu pin 1?
i have looked everywhere for help and this is the closest I’ve gotten so anything would help! Thanks!!

Were you able to figure it out? Hopefully this notifies someone

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