Electrical Instrument Cluster Failure

Nick3156

Member
Jul 8, 2016
5
1
13
25
Hello,
I have a 1994 mustang gt with major speedometer and odometer problems. Neither the speedometer or the odometer has worked for a while. I pulled the instrunent cluster to check the worm gears many have suggested and found then in tact. I did however find a burnt wire on the back of the instrument panel that led to "battery" right behind the speedometer. I jumped the broken section of this wire and plugged it right back in the car and thought i fixed my problem until the unit immediately started to smoke.... Any ideas on what else i could try? (Fuses are still fine)
 
  • Sponsors(?)


Nick3156

Member
Jul 8, 2016
5
1
13
25
IMG_20160729_145332.jpg
IMG_20160729_145340.jpg
IMG_20160729_145345.jpg
IMG_20160729_145353.jpg


I am almost certain that this would be the reason my speedometer and odometer are not working... but when i bridge the burnt wire leading to "BATT", smoke comes out of the dash :(
 

90sickfox

I didn't really have an issue with the stink...
SN Certified Technician
Mar 2, 2015
5,319
4,361
203
42
Something somewhere is shorting out along that circuit. What does that line lead to ?
 
  • Like
Reactions: Nick3156

Nick3156

Member
Jul 8, 2016
5
1
13
25
The burnt wire on one end leads to the grey connector on the wiring harness while the other end goes to one of the three pins on the back of the speedometer.
 

90sickfox

I didn't really have an issue with the stink...
SN Certified Technician
Mar 2, 2015
5,319
4,361
203
42
Check the bulb at the other end of the line...the gray thing twists and pops out. If the bulb is good its probably your stepper motor. Hope this will help. They are the same from 94- 98
 

Attachments

Nick3156

Member
Jul 8, 2016
5
1
13
25
Check the bulb at the other end of the line...the gray thing twists and pops out. If the bulb is good its probably your stepper motor. Hope this will help. They are the same from 94- 98
Thank You so much for that testing procedure! None of the bulbs in the instrument are burnt out including the larger and smaller bulbs. I will test the speedometer in the way described in the document and post my results.
 
Last edited:
  • Like
Reactions: 90sickfox

Nick3156

Member
Jul 8, 2016
5
1
13
25
I have looked all through my transformer collection and i can not seem to find any 9-12V AC adaptors... although i can find plenty of DC adaptors. Any other ideas on how i can get 12v AC?Assuming that the motor behind the speedometer is the source of the problem, I have searched online for "1994 mustang stepper motors" ("-instrument panel","-intrument cluster repair","-intrument guage repair", etc...). Do you know where i can locate the motors i need to replace?

UPDATE: I decided to go to the scrap yard and buy a mustang 1995 instrument cluster. The problem with the unit was something on the speedometer computer or motor. regardless when i switched out the tachometer and speedometer unit of the instrument cluster everything worked fine, after minor calibration :)
 
Last edited:
Thread starter Similar threads Forum Replies Date
Ruben instrument cluster failure 2.3L (N/A & Turbo) Tech 5
P Electrical 1988 mustang instrument cluster. Fox 5.0 Mustang Tech 5
derek2079 Instrument cluster lights not working 1965 - 1973 Classic Mustangs -General/Talk- 7
K WTB/Trade WTB 90-93 Black Instrument Cluster Bezel Interior Exterior Parts 2
revhead347 Has anyone ever sent in an instrument cluster for repair? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 9
GTLucy Electrical 98 GT Instrument Cluster - Repair or replace? SN95 4.6L Mustang Tech 2
M instrument cluster not working 2005 - 2014 S-197 Mustang -General/Talk- 0
wiskeymike80 Electrical Instrument gauge cluster not lighting up Fox 5.0 Mustang Tech 5
J 2002 gt vert instrument cluster issues SN95 4.6L Mustang Tech 1
DrSmart 94 GT Convertible Speedo Electrical Issue SN95 4.6L Mustang Tech 0
J Electrical 2019 12" Instrument Cluster 2015+ Specific Tech 6
R Interior and Upholstery 93 GT Canadian instrument cluster to US Fox 5.0 Mustang Tech 3
KaptKane Instrument cluster light "bleed thru" Fox 5.0 Mustang Tech 12
P instrument gauge cluster pigtail repair Fox 5.0 Mustang Tech 3
D 04 Mach1 instrument cluster lights not working 1996 - 2004 SN95 Mustang -General/Talk- 1
mac16 Expired 4 Instrument Florida 50 Gauge Cluster (pic) Interior Exterior Parts 2
David Klinner Dome Light And Instrument Cluster Back Lights 1996 - 2004 SN95 Mustang -General/Talk- 6
92Apocalypso Swapped Instrument Cluster And Now Air Bag Light Keeps Blinking... Fox 5.0 Mustang Tech 6
F Instrument Cluster Flex Circuit Shorted - Repair/replace? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 9
Sun Dropsz Instrument Clusters Going Crazy Fox 5.0 Mustang Tech 9
utemachine Instrument Cluster Fuse Popping Fox 5.0 Mustang Tech 7
K Instrument Cluster Stopped Working..please Help 1996 - 2004 SN95 Mustang -General/Talk- 10
M 95 V6 Instrument Cluster Light Issues 1994 - 1995 Specific Tech 0
wiseguyk Interior and Upholstery How I Fixed My Broken Instrument Bezel Brackets 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 23
S What Years Had Blue Lights Instruments Clusters 1996 - 2004 SN95 Mustang -General/Talk- 10
KENS89LX 96 Gt Instrument Cluster SN95 4.6L Mustang Tech 2
B.erazo712 Blue/red Wire. Instrument Cluster Back Light. Fox 5.0 Mustang Tech 6
J Instrument Cluster Light Bulbs 1996 - 2004 SN95 Mustang -General/Talk- 3
R Instrument Cluster Upgrade 2005 - 2009 Specific Tech 3
A Expired Instrument Cluster Interior Exterior Parts 2
stang89bidges Diy 87-93 Mustang Instrument Cluster Led Upgrade And Triple Guage Pod Install Fox 5.0 Mustang Tech 4
sudahi51 1997 Gt Instrument Cluster Trouble SN95 4.6L Mustang Tech 2
THEUNDERCOATER Ribbon On Back Of Instrument Cluster? Fox 5.0 Mustang Tech 8
R Instrument Cluster-where To Purchase Online 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 5
Duc_Stang_95 V6 Instrument Cluster Needed 2005 - 2014 S-197 Mustang -General/Talk- 1
S Instrument Cluster Diagnostic Bulb Test- No Abs Light SN95 V6 Mustang Tech 3
S Opinions About The Instrument Cluster Diagnostic SN95 V6 Mustang Tech 0
cdurbin Instrument Cluster Lighting - Led's? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 20
88vert5oh Instrument Cluster Questions. Fox 5.0 Mustang Tech 7
omar2006 Radio/instrument Cluster Lights Won't Turn On Fox 5.0 Mustang Tech 1
StanglovR1 Instrument Cluster Diagnosis Plz Help!!! SN95 4.6L Mustang Tech 2
smoothiebun 96 Mustang Instrument Cluster Issue SN95 V6 Mustang Tech 1
bstinger26 Instrument Cluster SN95 4.6L Mustang Tech 2
bstinger26 Instrument Cluster SN95 4.6L Mustang Tech 1
D ECT / Datalogger / instrument cluster - Gauge issue Fox 5.0 Mustang Tech 2
D Instrument Cluster Fitment Fox 5.0 Mustang Tech 3
T Does the fuel pump relay wiring run through the instrument cluster? Fox 5.0 Mustang Tech 6
N 65 Mustang Instrument Cluster Interior Exterior Parts 3
revhead347 Instrument Cluster Printed Circuit 1994 - 1995 Specific Tech 10
B instrument cluster LED options SN95 4.6L Mustang Tech 0
Similar threads