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

Reverse lights went out.

  • Thread starter Thread starter johnt785
  • Start date Start date Oct 20, 2007

johnt785

Member
Jan 22, 2004
158
3
18
Wichita, Kansas
Oct 20, 2007
#1
  • Oct 20, 2007
  • #1
Both of my reverse lights went out. My take is that both lights didn't just happen to burn out. So how do I fix this? Is there a switch that got fried or what?
 

jrichker

StangNet's favorite TOOL
In Remembrance. Thank you for your contributions
Mar 10, 2000
27,512
2,813
234
Dublin GA
Oct 20, 2007
#2
  • Oct 20, 2007
  • #2
Don’t assume that both bulbs can’t be burned. Out. Check both of them

Then check the fuse...

Diagram courtesy of Tmoss & Stang&2birds


Then check the backup switch...

The Tremec 3550 puts the switch in the same location as the T5.



The backup switch wiring connector has 2 contacts that push on the 2 studs that stick out of the top of the switch.

The power side of the connector will be 12 volts anytime the ignition switch is in the Run position. No 12 volts and you have problems with a fuse or the wiring

The lights side will be 12 volts when the ignition switch is in the Run position and the transmission is in reverse. No 12 volts on the lights side and the switch is bad.

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

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
 

SuperStang83

Founding Member
Mar 21, 2001
1,693
0
49
Boyertown, Pa
Oct 20, 2007
#3
  • Oct 20, 2007
  • #3
Always start with the easiest and cheapest thing. Don't assume that both bulbs didn't burn out.
 

johnt785

Member
Jan 22, 2004
158
3
18
Wichita, Kansas
Oct 20, 2007
#4
  • Oct 20, 2007
  • #4
I just went out there, It's not the bulbs nor the fusebox #5 breaker. So I figure my next move is to jack the car and take a look at the#18 BACK UP LIGHT SWITCH?
Could it have jiggled loose over the dirt roads?
 

Roland69

Sergeant Tangnet
Sep 17, 2005
2,867
3
58
Port Elgin, Ontario
Oct 20, 2007
#5
  • Oct 20, 2007
  • #5
I have seen a few common problems..
both bulbs could have burnt out (maby one a few days before and you didn't notice)

a bad wire or broke wire or connection somewhere

reverse switch on trans

they are normally the most common problem
 

Foster9887GT

New Member
Jul 12, 2007
7
0
0
Oct 20, 2007
#6
  • Oct 20, 2007
  • #6
Not tring to take over the thread, its the same topic soo.....My back-up light switch isnt connected. Ive tried to connect it but it wont reach to the connecting part. Anyone know why this is? Im thinking ill have to splice in some wire to make it longer.....
 

93gtmustang

10 Year Member
Oct 21, 2006
524
43
49
Oct 20, 2007
#7
  • Oct 20, 2007
  • #7
I just lost my turn signals and reverse lights. I got the turn signals back, but no reverse lights.
I read your post.
I pushed in on a plug on the drivers side of the trans. and got my reverse lights back.
It's worth a try.
 
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