1992 Ford Bronco tail, and dash lights not working, why?

The turn signals and brake lights use the same circuit and filament in the bulbs. The tail lights are on the other circuit which comes from the headlight switch.
Do you have power on the tail light fuse ?

Sounds like you lost the ground to the rear lights.

I have an 86. Under the dash on drivers side are two 1/4 turn black knobs that release a cover over the fuse panel. There is a diagram on the inside.

"painless wiring kit" maybe available for your application. sometimes not so "painless" though

The dash lights and tail lights are usually on the same fuse, look for the tail light fuse. You may want check the wiring at the rear of the vehicle, especially trailer light wires. If your truck has one of those add in connectors for trailer lights, that you plug into the wire harness, you may want to take that apart. They sometimes get corroded and short out.

The dash switch can affect the operation of the rear key switch. 1st thing to do is replace the dash switch and that will prob fix it all.

The brake light and the turn signal are the same bulb. Most of the time if the bulb on the dash stays on it is because a bulb is blown and thats the way it tells you.

Sounds like the fuse...check all of your fuse under and around the drivers side dash...it could also be the light bulbs are burnt out...pull the bulbs out and check to see if they are blackend

when my tail lights and dash lights w out my hookup for trailer lights were grounding each other out causing my fuse to blow for my tail lights and dash. i would check all your wiring and make sure nothing is touching or bare.

can only really be the wiring with what you have told me? if you take an voltage meter and check for voltage. if nothing then maybe a quick look at the lighting tracks on the unit itself.