Electrical Mystery Wire For Ignition Switch

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jrichker

StangNet's favorite TOOL
SN Certified Technician
Mar 10, 2000
27,243
2,594
234
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Dublin GA
lowendmac.com
Copy and save these links, there is a lot of useful information there...

Diagrams courtesy of Tmoss & Stang&2birds

Ignition switch wiring


Starter circuit


See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring; http://www.veryuseful.com/mustang/tech/engine/ Everyone should bookmark this site.

94-95 Mustang wiring diagrams
http://www.veryuseful.com/mustang/tech/engine/#95-95Diagrams

Complete computer, actuator & sensor wiring diagram for 91-93 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 88-91 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

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

O2 sensor wiring harness
http://www.veryuseful.com/mustang/tech/engine/images/mustangO2Harness.gif

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

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

TFI module differences & pin out
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

Mustang 5.0 Lights and Radio schematic, by TMoss:
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxLights-Radio_diag.gif

87-92 power window wiring
http://www.veryuseful.com/mustang/tech/engine/images/mustang87-92 PowerWindowWiring.gif

93 power window wiring
http://www.veryuseful.com/mustang/tech/engine/images/mustang93PowerWindows.gif

T5 Cutaway showing T5 internal parts
http://www.veryuseful.com/mustang/tech/engine/images/5_Speed_Cutaway_Illustrated.jpg

Visual comparison of the Ford Fuel Injectors, picture by TMoss:
http://www.veryuseful.com/mustang/tech/engine/images/Ford_Injector_Guide.jpg

Convertible top motor wiring http://www.veryuseful.com/mustang/tech/engine/images/mustang88VertTopMotorCkt.gif

Engine mounted fuel injector harness
http://www.veryuseful.com/mustang/tech/engine/images/mustangEngineHarness.gif

Location of the TPS, IAB, and the 10-pin connectors on a 5.0, picture by TMoss:
http://www.veryuseful.com/mustang/tech/engine/images/TPS_IAB_Pic.jpg

Starter circuit
http://forums.stangnet.com/attachment.php?attachmentid=21328&d=1080916057
 

DuderMcMerican

Active Member
Mar 7, 2016
148
9
28
Woodbridge, VA
Copy and save these links, there is a lot of useful information there
Thanks for the quick reply!

Those links are extremely useful. I have printed many of the diagrams and keep them in the car for quick reference (I also have the shop manuals, but the electrical can be frustrating because my wiring colors usually don't match the diagrams/pinouts:bang:).

In this case, I haven't found any diagram or forum mentions of the wire pictured. It looks like it was spliced into the red/green ignition wire by a previous owner and later severed. My plan is to cut out that butt connector and make a proper splice, but I don't know what to do about the stray wire. There's also a severed wire of the same gauge that terminates in the general vicinity of the ignition switch, but it's a different color so I'd assume it wasn't connected to the first wire. I will try to track that second wire to see where it leads. I just don't know what might have been spliced into pictured ignition switch wire at one time.
:shrug:
 

jrichker

StangNet's favorite TOOL
SN Certified Technician
Mar 10, 2000
27,243
2,594
234
74
Dublin GA
lowendmac.com
It could be an alarm or other accessory since it was spliced in. At some point in time , the PO removed it and left the stub. That stub is a short circuit looking for a time to happen...
 
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