My tail lights stopped working about a month ago and im just getting around to fixing it, its not a daily driver yet lol.
The driving lights and turn signals still work, its just the brake lights that dont.
I have replaced the brake light switch thing on the petal assy, so I know thats good and it gets power to it.
I cant find a good fuse box diagram to know which fuse it is but i have checked every single fuse lol theyre all good. Is there a relay somewhere or a external fuse or something in there im missing?? I know the bulbs are good too.
its a 1982 f100 xlt lariat 302 lonbed single cab if that helps any.
please help, this is driving me crazy lol

 

If the rear turn signals flash nice and bright then the wiring is OK as the brake and turn signal use the same bulb filament. (The tail light uses same bulb different filament).
The only things left are the turn signal switch and the hazard switch. The brake light wiring passes through the turn signal switch so a bad switch could cause your symptoms.

Edit: Use a test light or volt meter to be sure you are getting power at the turn signal switch when the brake pedal is pressed. If not could be wiring between brake switch and turn signal switch.

 

I have the wiring diagram for the 1982 model year scanned. if you want a copy PM your e-mail address.
CB

 

I had this same problem and it ended up being the wiring harness at the rear of the frame. Everything was getting a good connection except my brake lights, which ended up being a severely corroded terminal.