Electrical electrical issue?

[jrichker]

@fredfifty

Recall on Ford Ignition switches:

Revised 7-June-2014 to add Torx bit picture and source. Also added replacement ignition switch wiring pigtail picture, part numbers and sources.

Some of the symptoms of ignition switch problems are things that don’t work or are intermittent like radio, turn signals, wipers or heater.

There was a FREE recall on Ford ignition switches. They overheat and sometimes catch fire. That burns up the steering column and sometimes the car interior. Since this is very old information, you may not be able to get the switch replaced for free anymore. The auto parts stores sell the switches for $13-$15.

While you are working on the switch, check the wiring and connector closely. A replacement connector with new wiring pigtails is available from most auto parts stores

AutoZone and Advanced Auto Parts have the same Part Number: 434 - may have to order, not always in stock

Advanced Auto Parts alternate part number: PT5534

Saleen0679 was nice enough to dig this up for us awhile back: How to replace ignition switch on 1979-1993 Mustangs.
http://www.mustangandfords.com/how-to/engine/5657/


Torx bit set from Advance Auto Parts

Autocraft torx bit set – have small hole in tip for tamper proof screws.
Part No. AC571/W1386 Cost approx. $12 +tax

Diagrams courtesy of Tmoss & Stang&2birds

Ignition switch wiring

Fuel, alternator, A/C and ignition wiring

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.

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

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

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

 

[fredfifty]

ok so changed to a new motorcraft ignition switch, had battery and alternator check and they passed, sanded down ground points to shiny metal for good contact. still no crank no start no dash lights but headlights still turn on and key still chimes

 

[General karthief]

Do you have power coming out of the ignition switch in the crank position?

 

[fredfifty]

Do you have power coming out of the ignition switch in the crank position?

how would i check that?

 

[fredfifty]

ok so is it the gray/yellow wire or black/light green wire to check for power on the ignition switch?

 

[General karthief]

Ignition switch wiring http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif
#37 white/pink wire, to clutch interlock (neutral safety switch for auto)
Also check the two yellow wires #37 to fuse link (my guess this is where your problem lies but double check)

 

[fredfifty]

tested all 3 wires mentioned, grounded test lamp, turned key to crank and no power

 

[fredfifty]

any idea what that the blank slot is on the pigtail end of that ignition switch? under the outter yellow wire

 

[General karthief]

Nothing goes there.
look at the ignition wring pic above.
do you have power coming into the switch?

 

[fredfifty]

ok so something happened. i take seat out for better access and for s and giggles i turn key and it starts. now i go to check wires at solenoid while running and touch and maybe wiggle wires on battery side of solenoid and motor cuts out and back to no dash lights no crank no start.

 

[fredfifty]

well , i think this is the issue, that yellow wire is just barely touching the solenoid post

 

[General karthief]

Lets hope that's it

 

[fredfifty]

Lets hope that's it

hooked it up and we’re back in business. im 99% sure that was it. thanks for the help, man!

 

[General karthief]

Well you did all the work
i am just the cheering section.