• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

Electrical Turn Signal / Lights Issue

  • Thread starter Thread starter 86SilverFox
  • Start date Start date Jun 2, 2025
8

86SilverFox

New Member
Jun 2, 2025
6
0
1
Kentucky
Jun 2, 2025
#1
  • Jun 2, 2025
  • #1
1986 LX

When the headlights are turned on the hazard signals and bright light signal turn on and the buzzer starts. Turn signals flash slowly. With the headlights off everything works as it should. New switch installed same problem.

Any help appreciated hate wiring.
 

Attachments

  • IMG_9763.webp
    630.4 KB · Views: 102
Last edited: Jun 3, 2025

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
6,191
4,291
183
Claremore, OK
Jun 2, 2025
#2
  • Jun 2, 2025
  • #2
Headlight switch, multifunction switch, ignition switch, or ??? By your screen name I will assume it’s a ‘86 and by the picture an LX. Any wiring modifications in the car that you know of? Does it do this with the ignition switch off, in the accessory, run, or crank positions?

Not. Hating your balls (okay Inam a little bit) but the more info you can provide up front the better.
 
8

86SilverFox

New Member
Jun 2, 2025
6
0
1
Kentucky
Jun 2, 2025
#3
  • Jun 2, 2025
  • #3
AeroCoupe said:
Headlight switch, multifunction switch, ignition switch, or ??? By your screen name I will assume it’s a ‘86 and by the picture an LX. Any wiring modifications in the car that you know of? Does it do this with the ignition switch off, in the accessory, run, or crank positions?

Not. Hating your balls (okay Inam a little bit) but the more info you can provide up front the better.
Click to expand...
Brand new headlight switch installed. As far as I know all the wiring is original. It does this with the key in every position. Ignition switch? I’ll take the hate don’t know what info would be needed or useful.
 

General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
28,114
10,733
213
polk county florida
Jun 2, 2025
#4
  • Jun 2, 2025
  • #4
Check that the headlight switch is the correct one.. There's a wire crossed or a bad ground. Ground wires for the headlight harness is on each side of radiator support near the headlights.
 

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
6,191
4,291
183
Claremore, OK
Jun 2, 2025
#5
  • Jun 2, 2025
  • #5
Is this a new issue or has the car done this since you have had it?
 
8

86SilverFox

New Member
Jun 2, 2025
6
0
1
Kentucky
Jun 3, 2025
#6
  • Jun 3, 2025
  • #6
General karthief said:
Check that the headlight switch is the correct one.. There's a wire crossed or a bad ground. Ground wires for the headlight harness is on each side of radiator support near the headlights.
Click to expand...
The exact switch that I replaced. As far as I can tell all the grounds in that area are in good shape unless I am missing them.
 
8

86SilverFox

New Member
Jun 2, 2025
6
0
1
Kentucky
Jun 3, 2025
#7
  • Jun 3, 2025
  • #7
AeroCoupe said:
Is this a new issue or has the car done this since you have had it?
Click to expand...
It is a new issue.
 

General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
28,114
10,733
213
polk county florida
Jun 3, 2025
#8
  • Jun 3, 2025
  • #8
Check for a burned out bulb, pop the flasher out, see if it still malfunctions, it won't blink but should still light up.
 
You must log in or register to reply here.

Similar threads

8
Grounding issue?
  • 86SilverFox
  • May 16, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
4
Views
227
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 31, 2026
86SilverFox
8
A
SN95 Multifunction Madness! Need some big brain assistance from you folks
  • Awnaw
  • Wednesday at 3:30 PM
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
1
Views
67
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Wednesday at 9:37 PM
gkomo
T
Need help 67 hazard flashers not working
  • THS70
  • Jan 21, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
15
Views
1K
1965 - 1973 Classic Mustangs -General/Talk- Jan 29, 2026
Noobz347
T
Inside is completely dead
  • TunaCar
  • Oct 18, 2026
  • SN95 4.6L Mustang Tech
Replies
11
Views
286
SN95 4.6L Mustang Tech Oct 20, 2026
DadLife0724
A
1966 Mustang coupe / Brake lights and left rear turn signal not working.
  • ArizonaRob1966
  • Nov 3, 2025
  • Classic Mustang Specific Tech
Replies
2
Views
479
Classic Mustang Specific Tech Dec 24, 2025
Mcmahst
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech
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?