Help no left turn signal but have brake light

[fordboy84]

ok to start blinker was flashing like crazy so first thing i thought.. Blown blub but replace still not working thought maybe the socket was bad nope tried the other side that work still not working.. Next i replace the turn signal switch and same issue.. Looked at the wiring and the plug on the back of truck was rotton.. So i replaced it now i have left brake but still no rear left turn signal front works but fast blink.. Replaced the flasher in the dash still same issue any input would be great thanks!!!!

[fordboy84]

anyone????

[dhanna6powerstroke]

Each turn signal has it's own fuse.

[mbahr22250]

I think you have a bad wire somewhere. If the the front one flashes fast and you have brake lights then you know it's not the fuse, bulb, or socket. I would start at the light and work your way forward looking for corroded or broken wires or spots where the insulation on the wire bulges a little telling you that it's corroded under the insulation. These spots you can usually pull apart with your hands. Common spots to corrode are anywhere there is a splice or connection.