• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-

89 power window issue

  • Thread starter Thread starter Creomod
  • Start date Start date Sep 5, 2025

Creomod

5 Year Member
Sep 14, 2018
530
43
48
San Antonio,Texas
Sep 5, 2025
#1
  • Sep 5, 2025
  • #1
I have a 89 coupe . Haven’t had an issue it’s my daisy but all of a sudden the power windows want to act up. I removed buttons cleaned the copper still doing it. Swapped the power window relay/fuse still the same . It’s weird but it’s doing it when I put key on forward like when it’s on. But if I shut car off and put key back that one time it works. Any ideas? Anyone
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
43,153
21,326
234
Box behind Walmart
Sep 5, 2025
#2
  • Sep 5, 2025
  • #2
Ignition switch
 
Reactions: Creomod and AeroCoupe

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,950
10,589
203
polk county florida
Sep 5, 2025
#3
  • Sep 5, 2025
  • #3
I agree, turn key to 'on' position, don't need to start engine, push the window switch, if no worky hold switch while 'jiggling ' key,
 
Reactions: Creomod

Creomod

5 Year Member
Sep 14, 2018
530
43
48
San Antonio,Texas
Sep 5, 2025
#4
  • Sep 5, 2025
  • #4
General karthief said:
I agree, turn key to 'on' position, don't need to start engine, push the window switch, if no worky hold switch while 'jiggling ' key,
Click to expand...
So when you say ignition switch do you mean the plastic one that goes on Colum or the cylinder key part?
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
43,153
21,326
234
Box behind Walmart
Sep 5, 2025
#5
  • Sep 5, 2025
  • #5
The plastic one.

https://www.cjponyparts.com/ignition-switch-with-repair-harness-kit-mustang-1979-1993/p/ISAK1/
 
Reactions: Creomod

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,950
10,589
203
polk county florida
Sep 6, 2025
#6
  • Sep 6, 2025
  • #6
Noobz is talking about the switch under the dash, I'm giving a way to 'test' that switch, the switch gets loose at the plug and stuff gets to acting funny, making intermittent connections, melting plastic.
 
Reactions: Creomod

nickyb

I gotta say i never painted my nuts, Never Ever
15 Year Member
Apr 3, 2009
2,979
1,626
153
nevada
Sep 6, 2025
#7
  • Sep 6, 2025
  • #7
Our beloved foxes had a recall on them plastic ign.switches, some of us use zip ties to hold them together for awhile,but they are cheap enough to just replace.
 
Reactions: Creomod

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
43,153
21,326
234
Box behind Walmart
Sep 6, 2025
#8
  • Sep 6, 2025
  • #8
Well let's face it. Fox wiring is "barely adequate" from nose to tail.
 
Reactions: Creomod

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,950
10,589
203
polk county florida
Sep 6, 2025
#9
  • Sep 6, 2025
  • #9
Noobz347 said:
Well let's face it. Fox wiring is "barely adequate" from nose to tail.
Click to expand...
Same basic wiring since the started putting 12 volt charging systems but it worked, stop comparing automotive systems then and now, we can still fix our cars.
Most times the door switches just need cleaning or has a loose connection.
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
43,153
21,326
234
Box behind Walmart
Sep 6, 2025
#10
  • Sep 6, 2025
  • #10
General karthief said:
Same basic wiring since the started putting 12 volt charging systems but it worked, stop comparing automotive systems then and now, we can still fix our cars.
Most times the door switches just need cleaning or has a loose connection.
Click to expand...

 
Reactions: Creomod and General karthief

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,950
10,589
203
polk county florida
Sep 7, 2025
#11
  • Sep 7, 2025
  • #11
Noobz347 said:
Click to expand...
And what's wrong with that???
 

Creomod

5 Year Member
Sep 14, 2018
530
43
48
San Antonio,Texas
Sep 10, 2025
#12
  • Sep 10, 2025
  • #12
nickyb said:
Our beloved foxes had a recall on them plastic ign.switches, some of us use zip ties to hold them together for awhile,but they are cheap enough to just replace.
Click to expand...
 

Creomod

5 Year Member
Sep 14, 2018
530
43
48
San Antonio,Texas
Sep 10, 2025
#13
  • Sep 10, 2025
  • #13
Update ! It was the ignition switch loose bought another just in case. Wow that little switch can cause you to go nuts
 
Last edited: Oct 5, 2025

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,950
10,589
203
polk county florida
Sep 10, 2025
#14
  • Sep 10, 2025
  • #14
Creomod said:
Update! lol still haven’t had time to get in there but car starting to off on me. Happened at the light juat barley left the house cat wasent even warm yet lol.
Click to expand...
WUT???
 
Reactions: Creomod
W

WillWho?

Member
Apr 1, 2018
24
19
13
Oct 4, 2025
#15
  • Oct 4, 2025
  • #15
Noobz347 said:
Click to expand...
That is a Fox body direct to power source connection. I think the part number is FK0001D9005UP. If it has a white nib by the prongs, it is from 1990–1993 and the part number is Fi0001RE9005Y.
 
Reactions: Creomod
You must log in or register to reply here.

Similar threads

Engine Fuel not pumping
  • Creomod
  • Apr 13, 2026
  • Fox 5.0 Mustang Tech
  • 2 3
Replies
51
Views
1K
Fox 5.0 Mustang Tech Jul 22, 2026
Noobz347
89 LX Electrical Troubles
  • fun331
  • Oct 25, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
5
Views
353
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Nov 27, 2025
fun331
C
C4 trans help needed
  • CPH89LX
  • Apr 26, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
6
Views
224
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Apr 28, 2026
CPH89LX
C
T
Progress Thread 2002 Mustang 3.8L CV
  • TheIncompetentMechanic
  • May 26, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
1
Views
87
1996 - 2004 SN95 Mustang -General/Talk- Jun 1, 2026
TheIncompetentMechanic
T
Fox Fuel Pump Issues After Replacement/Upgrade
  • Ryu
  • Jun 23, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
23
Views
600
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jul 5, 2026
Ryu
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?