Dash lights out and I can't fix them, changed all bulbs, computer, all switches, I am stumped

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20+ Year Stangneter :roc</strong><span class=
Jan 29, 2003
455
0
16
Hi everyone,

As I said in the title all of my dash lights are out. I have already done the following:

  • Changed all bulbs
  • Changed headlight switch
  • Changed dimmer switch
  • Changed engine computer
I have not been personally doing the work. A good friend of mine is a professional car stereo installer so he is very good with wiring and working on car interiors. After changing all this, with no success, I am asking the board for help (yes, I should have come here in the first place...that is a different story)

Thanks in advance!
 
Get the helm inc electrical book for your year and just trace the wires.

Also make sure to check the connector that goes to the headlight switch.
 
Hey, I checked the dimmer switch, replaced it in fact. I think I have a manual, will use it. I know he traced the wire with a test-light. Is there a foil on the back of the cluster that might be at fault?
 
The instrument cluster circuit is a thick plastic sheet with copper traces on it to connect the components. If it is broken, it cannot be repaired by any method I know of.
1.) Does the instrument fuse have voltage on it?
2.)Does the dash voltmeter work? If so, you know that the panel is getting voltage.

See http://www.stangnet.com/tech/cluster87-93.pdf for more help - see page 2 for the 87-89 connections. You will need the Adobe Acrobat viewer which is also a free download – http://get.adobe.com/reader/

Diagrams courtesy of Tmoss & Stang&2birds

mustangFoxLights-Radio_diag.gif


MustangFuseBox.gif


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.

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 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 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/91-93_5.0_EEC_Wiring_Diagram.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 & 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