fox wiring expert wanted

[67shelbygt]

HI all well i havea question i recently purchased a summit efi conversion harness...to me it looks identical to a 90s fox harness now the origional instructions were destroyed (also i purchased this kit second hand but unused) so i cant get a new copy of the instructions...but the kit was shipped with a install instruction kit from the ford svo install kit ive been told they are the same kit but in the instructions i have there is only one brown plug next to the self test plug and the harness actually has two a black and grey plug and the wiring on the green plug next to the computer has different wiring than the instructions suggest..to run the fuel pump etc now has anyone done this conversion and run into this problem..ive looked online and cant locate any diagrams of the black and grey plug setup only the brown one...and im quite certain that in my past experiences with fox cars all the ones i worked on had the dual plugs not the single...any ideas suggestions appreciated in advance

 

[TrophyHead]

These might be for the windshield wiper motor. Which colors wire are coming off of the black and grey
connectors?

Are these multi wire connectors or single wire? Round sockets or rectangle?

 

[jrichker]

See the following website for some help from Tmoss (diagram designer) & Stang&2Birds
(website host) for help on 86-95 5.0 Mustang wiring Mustang FAQ - Engine Information Everyone should bookmark this site.

Ignition switch wiring
http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif

Fuel, alternator, A/C and ignition wiring
http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

Complete computer, actuator & sensor wiring diagram for 88-91 5.0 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

Complete computer, actuator & sensor wiring diagram for 91-93 5.0 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/91-93_5.0_EEC_Wiring_Diagram.gif

Complete computer, actuator & sensor wiring diagram for 94-95 5.0 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/94-95_5.0_EEC_Wiring_Diagram.gif

Vacuum diagram 89-93 Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg

Vacuum Diagram 87-93 Mustangs
The diagram says 88 Mustang, but except for the vacuum line connected to the MAP/Baro sensor, it is the same for all 5.0 Mustangs from 87-93. The 89-93 Mustangs vent the MAP/Baro sensor to open air.
http://www.veryuseful.com/mustang/tech/engine/images/88Stang5.0Vacuum.gif

HVAC vacuum diagram
http://www.veryuseful.com/mustang/tech/engine/images/Mustang_AC_heat_vacuum_controls.gif

TFI module differences & pinout
http://www.veryuseful.com/mustang/tech/engine/images/TFI_5.0_comparison.gif

Fuse box layout
http://www.veryuseful.com/mustang/tech/engine/images/MustangFuseBox.gif


Also see Ford Fuel Injection for more diagrams and help with Mustang wiring.

 

[67shelbygt]

well in the instructions i have it says it should be one brown 8 pin round plug but instead have a black and grey both 8 pin plugs that as far as i remember is where the body harness ties into the ecm harness the instructions say there are all the wires here that need to be supplied power and a wire to run to the tach etc...also ill have a look at that site thanks for the help folks any other suggestions welcome also

 

[67shelbygt]

hey guys i guess i am lookin for an actual harness diagram like the link below...if you look at this link you will see plug number 31 this is the plug that my instructions say i need to tie into to supply power to the system etc..but the harness i have has two plugs one black and one grey...does anyone know does a pic of the other harness exist or why my harness has two plugs not one...i know i had some issues years back with an 89 and had a 92 wiring schematic and there were different wires im assuming there must be two different harnesses i just dont know for sure if the harness i have is for the 89 90 car or the 91-93 car...but yea if anyone can supply me with the harness description as shown but with the optional double plugs that would help me out imensely...thanks in advance folks also i looked at the very useful site and yea that gave me the diagram of the newer harness but doesnt give me the colors at those two plugs..i gues if i disect my harness a bit i could trace from the computer forward...that might be my only option unless someone has the pic i need out there...

http://www.veryuseful.com/mustang/tech/engine/images/mustangMainHarness.gif

 

[FobraR]

Wha are the actual wire colors you have at said plugs??
Try this link to see if there is light at the end (scroll ~3/4 way down): Ford Fuel Injection » Wiring Harnesses