EFI wiring experts needed!

[bwoldschool65]

Alright guys, i'm putting a 91 302 and aod with efi from a mustang into my 65 F-100. I'm needing to find out what all the plugs are used for that hook up close to the computer, besides the computer plug of course! but there are two others, what do they go to, can they be wired up directly or do they have to go through something else, any help appreciated

[Mustang_289]

The big green connector is for the EEC power relay and is important. There is an always hot wire black/orange and an ignition controlled that activates and closes the EEC when you turn the ignition key.

The two wire gray connector with a black wire and light green with yellow strip is for courtesy lights, which may not be required in your setup.

I hope this helps you, good luck!

[bwoldschool65]

well can i just plug a relay into the green one, and run the other directly to the ignition switch? It gets confuseing when retrofitting an old truck with efi. do any of these have to be run to the fuse block, i'm gonna use the mustang fuse block as well. thanks for your help! much appreciated.

[tmoss]

There are diagrams might help you out a lot at:

www.veryuseful.com/mustang/tech/engine

[Mustang_289]

The EEC relay R/LG wire is tied directly to the ignition switch. When the ignition switch is in the run position power is sent to the EEC relay, fuel pump intertia switch, and the TFI module for ignition. See the attached scan of schematic.

[bwoldschool65]

Alright, so i can just run my own wires from the eec relay connector to the ignition switch , but what all runs through the green 8 pin connector ?

[Mustang_289]

Here's what runs through the EEC relay itself:
R/LG wire from the ignition switch
BK/O wire from fuseable link located on hotside of starter selenoid
BK/LG to EEC, O2 sensor, and Computer looks like pins 40&60
Red to computer ping 37 and fuel pump inertia switch(you may not need in your config)

I would recommend getting a complete wiring guide, as you've got a lot of wiring to deal with in your conversion. I don't know if there's a step-by-step guide that walks you through the steps of converting to EFI from a carb setup.

[bwoldschool65]

well thanks for the help! your right i got a lot of work ahead of me .
i'm thinking i can just snip the connectors off the donor car and use it to keep things a little simpler. And easier to remove, Do you think a haynes repair manual would be easy to follow for this part of the wiring?
And what about the other connector? sorry to ask so many questions!

[tmoss]

Did you look at the wiring diagrams on the site I posted above???????

Save yourself some money

[Mustang_289]

Haynes repair manual will help you some, we've got one and it's got some of the wiring schematics, but I don't think it's complete. Check with the website tmoss recommended.

As far as the other connector, the gray one with two wires coming out? That is tied to the stang courtesy light circuit, you most likely will not need that one.

[bwoldschool65]

thanks guys, i did look at them that was all i needed to know, yall have been alot of help! i'm pretty sure i can get this bad-boy running with not to much work.