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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 06-14-2014   #1 (permalink)
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Question Help. Wiring issues

Good afternoon folks. I ma new here but you guys have helped me in many ways. I have finally put engine, transmission and differential in my 66 mustang from a donor 1994 Mustang Gt convertible. I am leaving the fuel injection on the motor and want to wire it up. I have pulled the wiring harness out of the mustang but I am lost now. I would really like to remove all the wires that I do not need for this install but again, I am lost. Could someone help me out?

I have a painless fuse box and wiring harness that wires are labled. Any way I can just hook up what I need from original Mustung harness to that so I don't have to use the Mustang fuse box? I have fuel injector harness connected right now to injectors and I have have the mustang harness on a table in the garage.


Please help?

What are the essentials I need to make the 302 efi with the AODE and the differential all work with new fuse box I have?
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Unread 06-14-2014   #2 (permalink)
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Hello. I would think that the simplest way to accomplish this would be to use the computer out of the 94 Mustang. The part number on that is F4VF-12A650-BA. I think that they run about 120 bucks, but, I'm not sure about that. That way you have all of the wiring and the computer for the 94, so, the computer thinks that it's still in the 94.
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Unread 06-14-2014   #3 (permalink)
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Default Help. Wiring issues

I have the computer it is just the wiring that is overwhelming. Would I need the power distribution box? Do I need all the underdash wiring since I already have a fuse box? What wires can I eliminate?
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Unread 06-14-2014   #4 (permalink)
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Hi again. The answer to those three questions combined would be in the form of a book. You won't need the entire underdash harness from the 94, but, what you will be needing is the aforementioned book, which, fortunately, Ford has already written for you. You need the factory shop manual for the electrical/vacuum systems in a 94 Mustang, and, with that, you can go through, one system at a time, and see what is needed, what is not, which wires go where, all of that stuff. That's why I have all of the factory manuals for the vehicles that I drive. I don't actually need them for everyday car, a 64 1/2 Mustang, but, I also have horrible weather/ heavy load vehicle which is an 87 Bronco II. For that one, I have to refer to the factory manuals occasionally. I had no idea that you needed a special tool to replace the ignition module, for example. It's held on with two screws, but you can't see the screw heads, so there's really no way to figure out that these screws have these goofy looking heads that no screwdriver will fit. I don't know how comfortable you are with working on automotive electrical systems, but, I do know that you are about to get a whole lot better at it.
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Unread 06-15-2014   #5 (permalink)
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I have no clue about modifying your wiring harness. I do know that ford racing and several other vendors sell retrofit efi harnesses that are already cut down so they are plug and play. I also know how to use google lol and I found this website that has lots of information that may help you. Create a Custom EFI Installation
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Unread 06-17-2014   #6 (permalink)
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Default Help. Wiring Harness

Does anybody know? Has anyone done this and maybe can point things out to me.
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Unread 06-17-2014   #7 (permalink)
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hello; if you do not get an answer i would post this in the 5.0 tech section. they should be able to tell you right away. they are the fuel injector guys and have done lots of this stuff.

did you remove your entire stock wiring harness?

did you replace it all with a painful harness?
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Unread 06-17-2014   #8 (permalink)
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did you look at that website I linked to? it has basically step by step what you need to know. way more than I could help you with.
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