Reverse lights went out.

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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
MustangFuseBox.gif


Then check the backup switch...

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

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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
 
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
 
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.....
 
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.