Okay, what are the gibberish I am posting now?
These are the pin and connector layouts of the following year SEFI Main wire harness which has the 60 pin connector for the computer.
I tried to keep the first two connectors (or one connector as the case for '91-'93 Mustangs) found near the power brake booster under the hood at the top of the page. The next connector is the 8-pin green connector found near where the EEC is mounted in the passenger kick panel (except '86 which does not have but has a 3-pin connector for the fuel pump relay circuit which is located I think over on the driver's side kick panel after entering the interior on the passenger side oval grommet).
The last connector on the bottom is the infamous connector going to the HEGO/Low Oil sensor wiring harness. All connectors shown here are as viewed looking at the main SEFI wiring harness connector. The other connectors (like the black and white 10-pin connectors and various actuators and sensors) are all common although the wire codes may vary - but the wire purpose is the same.
First, 1986!
Bonus! 1988 California ONLY Mass Air SEFI Main Harness connectors:
One wire I couldn't find is the one which goes between the Fuel Pump Relay to the EEC pin 19. Odd. The harness isn't mine so I can't go back and trace it.
Next, 1989:
Now, 1990 (Early-patterned after the one from a '90 Mustang with a scheduled build date of 11/89)
(Too be added when I can kick my lazy scanner's @#!!)
1990 (Late - patterned after the one I have grabbed first)
And last, the '92-'93:
If anyone can fill out the information for 1991, I'd like to get that info since that is the one harness I haven't been able to get my hands on.
Also, if I have errors, let me know so I can research them. The '89 may be my most sketchiest since it is still in my daily driver and I didn't want to rip it out of the car to verify where each wire goes.
Dean T
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