Reverse lights not working on 1993 Ford Ranger

Standard Motor Products NS58 Neutral Backup Switch
This is what it looks like, it should be located where the shift cable attaches at the transmission

The reverse light is control via the linkage to neutral safety switch.

Moisture can collect inside of the neutral safety switch.

Have you checked the reverse switch on the transmission? Fuse in the fuse box?

My guess would be the neutral safety switch on the transmission.
The switch also acts as a backup light switch when the shifter is in reverse.
I would check for power at the switch for the reverse light circuit.

Look on the transmission and there is a sensor that hooks to the reverse lights and is threaded into the transmission. First check the bulbs and then check the fuse to the reverse lights and then the actual switch on the tranny.

check connection to reverse switch. or maybe bad reverse switch on the replaced trans.

There is a switch that controls the Neutral Safety Switch, and the Back-Up lights with the automatic transmission.

Manual trans usually have a single switch mounted where the shift rail inside the trans causes a switch to turn on the Back-up lights when you shift into reverse. Just a Back-up switch @ 15.00 + Ship on eBay for this type.

good luck

check the reverse switch as it's most likely failed. It'll be on the side of your transmission with several wires sticking out of it

On the side of your transmission will be a switch with several wires coming out of it. This is your reverse switch that turns on your reverse lights and most likely needs to be replaced

look uder the bumper