Ok guys, all of a sudden I have no rear park lights. If I turn a signal either way the front works right but both rears light up. When I put it in reverse my brake/park lights light up. My brake lights work right however. Only thing I've done is replaced the flasher a few days ago
because I had nothing. Any ideas??

 

Take a few minutes to fill in your profile, create a signature with your truck's specs, and upload some pics. We can't see your truck, so we have no idea if you're talking about a '77 or a '93 (or a 2008, and just posted in the wrong forum). If you don't know all your truck's details yet, read this caption:



Is there a trailer connector dangling on a sharp edge of the rear bumper? Or pinched between the body & frame? Or is its tape falling off, exposing the wires?

 

93 5.0 5spd 4x4

 

Have you checked all your fuses...? Whenever something like that ever happens to me its usually a stripped cable thats connected to whatever particular lights went out...

 

Actually, i could never find the real problem, so i made a whole new rear harness. everything is right back to normal now.