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

Parking and rear lights stay on even when the switch is disconnected..

  • Thread starter Thread starter flashstang04
  • Start date Start date Jan 18, 2009

flashstang04

New Member
Jun 7, 2004
154
0
0
Wichita Falls,Tx
Jan 18, 2009
#1
  • Jan 18, 2009
  • #1
Weirdest thing, On my 87 GT I can completely take the light switch off of the dash connectors and the parking lights and the rear lights stay on. They are pretty dim, but enough to run the battery down. The only way I can get them off is to disconnect the battery.. Any suggestions?
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
34
129
Jan 18, 2009
#2
  • Jan 18, 2009
  • #2
Look for melted wiring (shorting power to the parking light circuit). The parking light wire is brown.

Be sure your brake switch isnt staying closed as well.

Good luck.
 

93 LX

Founding Member
Jun 2, 2000
3,081
3
0
Norwalk, CA.
Jan 18, 2009
#3
  • Jan 18, 2009
  • #3
bad ground on the light circuit. check the mulitfunction switch....
 

flashstang04

New Member
Jun 7, 2004
154
0
0
Wichita Falls,Tx
Jan 18, 2009
#4
  • Jan 18, 2009
  • #4
Hmm ok, I checked all the bulbs..seemed fine. I put new ones in just to see..also, the switch has one small place that is brown, like it may have gotten hot from a spark. The thing is when I completely take the switch off of the connectors, the lights stay on. I can have two connectors attached to nothing and the lights stay on until I d/c the battery.
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
34
129
Jan 18, 2009
#5
  • Jan 18, 2009
  • #5
flashstang04 said:
Hmm ok, I checked all the bulbs..seemed fine. I put new ones in just to see..also, the switch has one small place that is brown, like it may have gotten hot from a spark. The thing is when I completely take the switch off of the connectors, the lights stay on. I can have two connectors attached to nothing and the lights stay on until I d/c the battery.
Click to expand...

Again, check the brown wire for voltage with the switch disconnected. You should have a nominal amount. Really check the back of the connector for melted wires. The brown wire probably melted and shorted to the power feed. Also check any aftermarket wiring on the lighting circuit (like for an alarm).
 

flashstang04

New Member
Jun 7, 2004
154
0
0
Wichita Falls,Tx
Jan 18, 2009
#6
  • Jan 18, 2009
  • #6
HISSIN50 said:
Again, check the brown wire for voltage with the switch disconnected. You should have a nominal amount. Really check the back of the connector for melted wires. The brown wire probably melted and shorted to the power feed. Also check any aftermarket wiring on the lighting circuit (like for an alarm).
Click to expand...

Good deal, Ill check that out and see if I can trace down a short. Thanks
 
You must log in or register to reply here.

Similar threads

E
2007 GT Stalls when lights or a/c turned on
  • ejscarfo
  • Jun 22, 2026
  • 2005 - 2009 Specific Tech
Replies
2
Views
141
2005 - 2009 Specific Tech Jun 29, 2026
ejscarfo
E
A
1987 5.0 speed density Foxbody crank no start
  • Alan2204
  • May 23, 2026
  • Fox 5.0 Mustang Tech
Replies
10
Views
315
Fox 5.0 Mustang Tech May 30, 2026
Mcmahst
2
Electrical mayhem
  • 2000ElectricGreen
  • Mar 13, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
2
Views
284
1996 - 2004 SN95 Mustang -General/Talk- Mar 24, 2026
2000ElectricGreen
2
A
95 GT parking brake instrument cluster light trouble
  • Aroenias
  • Jun 23, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
1
Views
244
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 24, 2025
Mustang5L5
1
Electrical 1985 mustang gt Led conversion trouble
  • 1985fox
  • Jan 5, 2026
  • Fox 5.0 Mustang Tech
Replies
10
Views
639
Fox 5.0 Mustang Tech Jan 15, 2026
1985fox
1
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?